Disable Max Min Helper on Z10 and below

Max Min Helper in z codegen uses LOCR instructions
which are unsupported below Z10. This commit disables
max min optimization when on Z10 and below.

Issue: #2969

Signed-off-by: Daniel Hong <daniel.hong@live.com>

compiler/z/codegen/ControlFlowEvaluator.cpp

@@ -910,6 +910,9 @@ lcmpHelper(TR::Node * node, TR::CodeGenerator * cg)
  */
 static TR::Register * maxMinHelper(TR::Node *node, TR::CodeGenerator *cg, bool isMax)
    {
+   TR_ASSERT_FATAL(cg->getS390ProcessorInfo()->supportsArch(TR_S390ProcessorInfo::TR_z196),
+      "cannot evaluate %s on z10 or below", node->getOpCode().getName());
+
    TR::Register *registerA = cg->gprClobberEvaluate(node->getFirstChild());
    TR::Register *registerB = cg->evaluate(node->getSecondChild());
    // Mask is 4 to pick b when a is Lower for max, 2 to pick b when a is higher for min

compiler/z/codegen/OMRCodeGenerator.cpp

@@ -705,6 +705,10 @@ OMR::Z::CodeGenerator::CodeGenerator()
       {
       self()->setSupportsAtomicLoadAndAdd();
       }
+   else
+      {
+      comp->setOption(TR_DisableMaxMinOptimization);
+      }
 
    if (_processorInfo.supportsArch(TR_S390ProcessorInfo::TR_zEC12))
       {