Recognize JNI local refs in JNINativeMethodFrames

First 8 JNI local refs are directly stored inside the
J9SFJNINativeMethodFrame before allocating J9JNIReferenceFrame to
store additional references. StackWalker should check if the object
pushes from method frame is JNI local when walking O-Slots.

Signed-off-by: Jack Lu <Jack.S.Lu@ibm.com>

runtime/vm/swalk.c

@@ -701,6 +701,7 @@ static void
 walkMethodFrame(J9StackWalkState * walkState)
 {
 	J9SFMethodFrame * methodFrame = (J9SFMethodFrame *) ((U_8*) walkState->walkSP + (UDATA) walkState->literals);
+	BOOLEAN isJNINative = (J9SF_FRAME_TYPE_JNI_NATIVE_METHOD == (UDATA)walkState->pc);
 
 	walkState->bp = (UDATA *) &(methodFrame->savedA0);
 	walkState->frameFlags = methodFrame->specialFrameFlags;
@@ -734,7 +735,7 @@ walkMethodFrame(J9StackWalkState * walkState)
 #endif
 
 	if ((walkState->flags & J9_STACKWALK_ITERATE_O_SLOTS) && walkState->literals) {
-		if (walkState->frameFlags & J9_SSF_JNI_REFS_REDIRECTED) {
+		if ((walkState->frameFlags & J9_SSF_JNI_REFS_REDIRECTED) || isJNINative) {
 			walkPushedJNIRefs(walkState);
 		} else {
 			walkObjectPushes(walkState);