Set register dep to exclude GPR0 for temp2Reg in inlineCompareAndSet

The temp2Reg is used by `VMnonNullSrcWrtBarCardCheckEvaluator` in some
cases in a `stbx` instruction, which can't have GPR0 as the RA argument
or it will act upon it as a null value.
This causes the an unexpected register spill in the middle of an
internal control-flow sequence that might not be fully executed.

Author: rmnattas

runtime/compiler/p/codegen/J9TreeEvaluator.cpp

@@ -8530,6 +8530,7 @@ static TR::Register *VMinlineCompareAndSetOrExchangeReference(TR::Node *node, TR
 
       TR::addDependency(conditions, temp1Reg, TR::RealRegister::gr11, TR_GPR, cg);
       TR::addDependency(conditions, temp2Reg, TR::RealRegister::NoReg, TR_GPR, cg);
+      conditions->getPostConditions()->getRegisterDependency(conditions->getAddCursorForPost() - 1)->setExcludeGPR0();
       TR::addDependency(conditions, offsetReg, TR::RealRegister::NoReg, TR_GPR, cg);
       TR::addDependency(conditions, temp4Reg, TR::RealRegister::NoReg, TR_GPR, cg);