Fix C4068

```
warning C4068: unknown pragma
```

Author: fjeremic

runtime/compiler/codegen/CodeGenGC.cpp

@@ -20,6 +20,7 @@
  * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
  *******************************************************************************/
 
+#if defined(J9ZOS390)
 //On zOS XLC linker can't handle files with same name at link time
 //This workaround with pragma is needed. What this does is essentially
 //give a different name to the codesection (csect) for this file. So it
@@ -28,6 +29,7 @@
 #pragma csect(CODE,"TRJ9CGGCBase#C")
 #pragma csect(STATIC,"TRJ9CGGCBase#S")
 #pragma csect(TEST,"TRJ9CGGCBase#T")
+#endif
 
 #include "codegen/J9CodeGenerator.hpp" // IWYU pragma: keep
 

runtime/compiler/codegen/CodeGenRA.cpp

@@ -20,6 +20,7 @@
  * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
  *******************************************************************************/
 
+#if defined(J9ZOS390)
 //On zOS XLC linker can't handle files with same name at link time
 //This workaround with pragma is needed. What this does is essentially
 //give a different name to the codesection (csect) for this file. So it
@@ -28,6 +29,7 @@
 #pragma csect(CODE,"TRJ9CGRABase#C")
 #pragma csect(STATIC,"TRJ9CGRABase#S")
 #pragma csect(TEST,"TRJ9CGRABase#T")
+#endif
 
 #include "codegen/J9CodeGenerator.hpp"
 

runtime/compiler/codegen/J9CodeGenPhase.cpp

@@ -20,6 +20,7 @@
  * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
  *******************************************************************************/
 
+#if defined(J9ZOS390)
 //On zOS XLC linker can't handle files with same name at link time
 //This workaround with pragma is needed. What this does is essentially
 //give a different name to the codesection (csect) for this file. So it
@@ -28,7 +29,7 @@
 #pragma csect(CODE,"TRJ9CGPhase#C")
 #pragma csect(STATIC,"TRJ9CGPhase#S")
 #pragma csect(TEST,"TRJ9CGPhase#T")
-
+#endif
 
 #include "codegen/CodeGenPhase.hpp"
 #include "codegen/CodeGenerator.hpp"

runtime/compiler/codegen/J9CodeGenerator.cpp

@@ -20,9 +20,11 @@
  * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
  *******************************************************************************/
 
+#if defined(J9ZOS390)
 #pragma csect(CODE,"TRJ9CGBase#C")
 #pragma csect(STATIC,"TRJ9CGBase#S")
 #pragma csect(TEST,"TRJ9CGBase#T")
+#endif
 
 #include <algorithm>
 #include "codegen/AheadOfTimeCompile.hpp"

runtime/compiler/codegen/J9GCStackAtlas.cpp

@@ -20,10 +20,11 @@
  * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
  *******************************************************************************/
 
+#if defined(J9ZOS390)
 #pragma csect(CODE,"TRJ9GCStackAtlas#C")
 #pragma csect(STATIC,"TRJ9GCStackAtlas#S")
 #pragma csect(TEST,"TRJ9GCStackAtlas#T")
-
+#endif
 
 #include "codegen/GCStackAtlas.hpp"
 #include "codegen/GCStackMap.hpp"

runtime/compiler/codegen/J9Instruction.cpp

@@ -20,14 +20,15 @@
  * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
  *******************************************************************************/
 
+#if defined(J9ZOS390)
 //On zOS XLC linker can't handle files with same name at link time
 //This workaround with pragma is needed. What this does is essentially
 //give a different name to the codesection (csect) for this file. So it
 //doesn't conflict with another file with same name.
 #pragma csect(CODE,"TRJ9InstBase#C")
 #pragma csect(STATIC,"TRJ9InstBase#S")
 #pragma csect(TEST,"TRJ9InstBase#T")
-
+#endif
 
 #include "codegen/Instruction.hpp"
 #include "codegen/CodeGenerator.hpp"

runtime/compiler/compile/J9Compilation.cpp

@@ -20,9 +20,11 @@
  * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
  *******************************************************************************/
 
+#if defined(J9ZOS390)
 #pragma csect(CODE,"TRJ9CompBase#C")
 #pragma csect(STATIC,"TRJ9CompBase#S")
 #pragma csect(TEST,"TRJ9CompBase#T")
+#endif
 
 #include "compile/J9Compilation.hpp"
 

runtime/compiler/env/J9CPU.cpp

@@ -20,9 +20,11 @@
  * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
  *******************************************************************************/
 
+#if defined(J9ZOS390)
 #pragma csect(CODE,"J9J9CPU#C")
 #pragma csect(STATIC,"J9J9CPU#S")
 #pragma csect(TEST,"J9J9CPU#T")
+#endif
 
 #include "env/CPU.hpp"
 #include "env/VMJ9.h"

runtime/compiler/env/J9ObjectModel.cpp

@@ -20,13 +20,15 @@
  * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
  *******************************************************************************/
 
+#if defined(J9ZOS390)
 //On zOS XLC linker can't handle files with same name at link time
 //This workaround with pragma is needed. What this does is essentially
 //give a different name to the codesection (csect) for this file. So it
 //doesn't conflict with another file with same name.
 #pragma csect(CODE,"J9ObjectModel#C")
 #pragma csect(STATIC,"J9ObjectModel#S")
 #pragma csect(TEST,"J9ObjectModel#T")
+#endif
 
 #include <algorithm>
 #include <limits.h>

runtime/compiler/optimizer/J9Optimizer.cpp

@@ -20,13 +20,15 @@
  * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
  *******************************************************************************/
 
+#if defined(J9ZOS390)
 //On zOS XLC linker can't handle files with same name at link time
 //This workaround with pragma is needed. What this does is essentially
 //give a different name to the codesection (csect) for this file. So it
 //doesn't conflict with another file with same name.
 #pragma csect(CODE,"J9Optimizer#C")
 #pragma csect(STATIC,"J9Optimizer#S")
 #pragma csect(TEST,"J9Optimizer#T")
+#endif
 
 #include "optimizer/Optimizer.hpp"