Remove supportsTrapsInTMRegion from OMR

Remove all the references to supportsTrapsInTMRegion from OMR as the
field has already been transferred to  OpenJ9.

Closes: eclipse-omr#1868
Signed-off-by: Bohao(Aaron) Wang <aaronwang0407@gmail.com>

compiler/codegen/OMRCodeGenerator.hpp

@@ -1399,9 +1399,6 @@ class OMR_EXTENSIBLE CodeGenerator
 
    bool supportsLengthMinusOneForMemoryOpts() {return false;}
 
-   // Java, likely Z
-   bool supportsTrapsInTMRegion() { return true; }
-
    // Allows a platform code generator to assert that a particular node operation will use 64 bit values
    // that are not explicitly present in the node datatype.
    bool usesImplicit64BitGPRs(TR::Node *node) { return false; }

compiler/z/codegen/OMRCodeGenerator.hpp

@@ -299,11 +299,6 @@ class OMR_EXTENSIBLE CodeGenerator : public OMR::CodeGenerator
 
    bool supportsLengthMinusOneForMemoryOpts() {return true;}
 
-   bool supportsTrapsInTMRegion()
-      {
-      return TR::Compiler->target.isZOS();
-      }
-
    bool inlineNDmemcpyWithPad(TR::Node * node, int64_t * maxLengthPtr = NULL);
    bool codegenSupportsLoadlessBNDCheck() {return TR::Compiler->target.cpu.getSupportsArch(TR::CPU::zEC12);}
    TR::Register *evaluateLengthMinusOneForMemoryOps(TR::Node *,  bool , bool &lenMinusOne);