Workaround for compiler reordering the InterpMethodContextFrame and the InterpreterFrame

Author: kg

src/coreclr/vm/prestub.cpp

@@ -1946,16 +1946,25 @@ extern "C" void STDCALL ExecuteInterpretedMethod(TransitionBlock* pTransitionBlo
     InterpThreadContext *threadContext = InterpGetThreadContext();
     int8_t *sp = threadContext->pStackPointer;
 
-    InterpMethodContextFrame interpMethodContextFrame = {0};
-    interpMethodContextFrame.startIp = (int32_t*)byteCodeAddr;
-    interpMethodContextFrame.pStack = sp;
-    interpMethodContextFrame.pRetVal = sp;
+    struct Frames
+    {
+        InterpMethodContextFrame interpMethodContextFrame = {0};
+        InterpreterFrame interpreterFrame;
+
+        Frames(TransitionBlock *pTransitionBlock)
+        : interpreterFrame(pTransitionBlock, &interpMethodContextFrame)
+        {
+        }
+    }
+    frames(pTransitionBlock);
 
-    InterpreterFrame interpreterFrame(pTransitionBlock, &interpMethodContextFrame);
+    frames.interpMethodContextFrame.startIp = (int32_t*)byteCodeAddr;
+    frames.interpMethodContextFrame.pStack = sp;
+    frames.interpMethodContextFrame.pRetVal = sp;
 
-    InterpExecMethod(&interpreterFrame, &interpMethodContextFrame, threadContext);
+    InterpExecMethod(&frames.interpreterFrame, &frames.interpMethodContextFrame, threadContext);
 
-    interpreterFrame.Pop();
+    frames.interpreterFrame.Pop();
 }
 #endif // FEATURE_INTERPRETER