Merge pull request #22290 from nbhuiyan/guard-nph-mhinvoke-0.54

(0.54) Guard peeking behaviour for invokedynamic/handle with an env option

Author: pshipton

runtime/compiler/optimizer/J9EstimateCodeSize.cpp

@@ -982,8 +982,14 @@ TR_J9EstimateCodeSize::processBytecodeAndGenerateCFG(TR_CallTarget *calltarget,
             break;
          case J9BCinvokedynamic:
          case J9BCinvokehandle:
-            nph.setNeedsPeekingToTrue();
-            heuristicTrace(tracer(), "Depth %d: Enabled peeking ILGen for method %s due to invokedynamic/invokehandle bytecode at bc index %d.", _recursionDepth, callerName, i);
+            {
+            const static bool enablePeekingForMHInvokes = feGetEnv("TR_enablePeekingForMHInvokes") ? true : false;
+            if (enablePeekingForMHInvokes)
+               {
+               nph.setNeedsPeekingToTrue();
+               heuristicTrace(tracer(), "Depth %d: Enabled peeking ILGen for method %s due to invokedynamic/invokehandle bytecode at bc index %d.", _recursionDepth, callerName, i);
+               }
+            }
             // intentional fallthrough
          case J9BCinvokehandlegeneric:
             // TODO:JSR292: Use getResolvedHandleMethod