Add API to get the AOT method header entry

Add an API to prevent doing manual pointer manipulation to get the AOT
method header entry from the SCC.

Signed-off-by: Irwin D'Souza <dsouzai.gh@gmail.com>

Author: dsouzai

runtime/compiler/compile/J9Compilation.cpp

@@ -358,6 +358,13 @@ J9::Compilation::printCompYieldStatsMatrix()
       }
    }
 
+TR_AOTMethodHeader *
+J9::Compilation::getAotMethodHeaderEntry()
+   {
+   J9JITDataCacheHeader *aotMethodHeader = (J9JITDataCacheHeader *)self()->getAotMethodDataStart();
+   TR_AOTMethodHeader *aotMethodHeaderEntry =  (TR_AOTMethodHeader *)(aotMethodHeader + 1);
+   return aotMethodHeaderEntry;
+   }
 
 TR::Node *
 J9::Compilation::findNullChkInfo(TR::Node *node)

runtime/compiler/compile/J9Compilation.hpp

@@ -147,6 +147,8 @@ class OMR_EXTENSIBLE Compilation : public OMR::CompilationConnector
    void * getAotMethodDataStart() const { return _aotMethodDataStart; }
    void setAotMethodDataStart(void *p) { _aotMethodDataStart = p; }
 
+   TR_AOTMethodHeader * getAotMethodHeaderEntry();
+
    TR::Node *findNullChkInfo(TR::Node *node);
 
    bool isAlignStackMaps() { return J9::Compilation::target().cpu.isARM(); }