Remove some unnecessary includes of GenericSignatureBuilder.h

Author: slavapestov

Diff for: include/swift/SILOptimizer/Analysis/DifferentiableActivityAnalysis.h

@@ -49,7 +49,6 @@
 #define SWIFT_SILOPTIMIZER_ANALYSIS_DIFFERENTIABLEACTIVITYANALYSIS_H_
 
 #include "swift/AST/GenericEnvironment.h"
-#include "swift/AST/GenericSignatureBuilder.h"
 #include "swift/SIL/SILFunction.h"
 #include "swift/SIL/SILModule.h"
 #include "swift/SIL/SILValue.h"

Diff for: lib/IRGen/GenType.h

@@ -34,7 +34,6 @@ namespace llvm {
 }
 
 namespace swift {
-  class GenericSignatureBuilder;
   class ArchetypeType;
   class CanType;
   class ClassDecl;

Diff for: lib/IRGen/IRGenModule.h

@@ -85,7 +85,6 @@ namespace clang {
 
 namespace swift {
   class GenericSignature;
-  class GenericSignatureBuilder;
   class AssociatedConformance;
   class AssociatedType;
   class ASTContext;

Diff for: lib/Sema/TypeCheckGeneric.cpp

@@ -20,7 +20,6 @@
 #include "swift/AST/DiagnosticsSema.h"
 #include "swift/AST/ExistentialLayout.h"
 #include "swift/AST/GenericEnvironment.h"
-#include "swift/AST/GenericSignatureBuilder.h"
 #include "swift/AST/ParameterList.h"
 #include "swift/AST/ProtocolConformance.h"
 #include "swift/AST/TypeCheckRequests.h"