Reimplement dynamic frame alignment for frames that are compiled via OSR or have more than 2 double…

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index e0ac2ee2ae9a931f50e2ef8cc1e9470da3d5dfa9..17d02ccd4e56f284af6c867d8fcfabf5f9d0dc19 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -469,6 +469,20 @@ StackFrame::Type StackFrame::GetCallerState(State* state) const {
 }
 
 
+Address StackFrame::UnpaddedFP() const {
+#if defined(V8_TARGET_ARCH_IA32) || defined(V8_HOST_ARCH_IA32)
+  if (!is_optimized()) return fp();
+  int32_t alignment_state = Memory::int32_at(
+    fp() + JavaScriptFrameConstants::kDynamicAlignmentStateOffset);
+
+  return (alignment_state == kAlignmentPaddingPushed) ?
+    (fp() + kPointerSize) : fp();
+#else
+  return fp();
+#endif
+}
+
+
 Code* EntryFrame::unchecked_code() const {
   return HEAP->raw_unchecked_js_entry_code();
 }