Do not rematerialize register for class pointer or method pointer

Do not rematerialize register for class pointer or method pointer if
it's AOT compilation because it doesn't have node info in register
rematerialization to create relocation record for the class pointer
or the method pointer.

Signed-off-by: Annabelle Huo <Annabelle.Huo@ibm.com>

compiler/x/codegen/OMRTreeEvaluator.cpp

@@ -392,7 +392,12 @@ TR::Register *OMR::X86::TreeEvaluator::loadConstant(TR::Node * node, intptr_t va
 
    TR::Instruction *instr = TR::TreeEvaluator::insertLoadConstant(node, targetRegister, value, type, cg);
 
-   if (cg->enableRematerialisation())
+   // Do not rematerialize register for class pointer or method pointer if
+   // it's AOT compilation because it doesn't have node info in register
+   // rematerialization to create relocation record for the class pointer
+   // or the method pointer.
+   if (cg->enableRematerialisation() &&
+       !(cg->comp()->compileRelocatableCode() && node && node->getOpCodeValue() == TR::aconst && (node->isClassPointerConstant() || node->isMethodPointerConstant())))
       {
       if (node && node->getOpCode().hasSymbolReference() && node->getSymbol() && node->getSymbol()->isClassObject())
          (TR::Compiler->om.generateCompressedObjectHeaders() || cg->comp()->target().is32Bit()) ? type = TR_RematerializableInt : type = TR_RematerializableLong;