Re-land Crankshaft-generated KeyedLoad stubs.

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index 9b06fb6fdcf6ba1bd64cd1eb3c005dab8d0d68c1..23bcedae1f9fc32d77c45fb15b46df30c7a2222c 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -617,13 +617,7 @@ bool StandardFrame::IsExpressionInsideHandler(int n) const {
 }
 
 
-void CompiledFrame::Iterate(ObjectVisitor* v) const {
-#ifdef DEBUG
-  // Make sure that optimized frames do not contain any stack handlers.
-  StackHandlerIterator it(this, top_handler());
-  ASSERT(it.done());
-#endif
-
+void StandardFrame::IterateCompiledFrame(ObjectVisitor* v) const {
   // Make sure that we're not doing "safe" stack frame iteration. We cannot
   // possibly find pointers in optimized frames in that state.
   ASSERT(!SafeStackFrameIterator::is_active(isolate()));
@@ -687,12 +681,33 @@ void CompiledFrame::Iterate(ObjectVisitor* v) const {
 
 
 void StubFrame::Iterate(ObjectVisitor* v) const {
-  CompiledFrame::Iterate(v);
+  IterateCompiledFrame(v);
+}
+
+
+Code* StubFrame::unchecked_code() const {
+  return static_cast<Code*>(isolate()->heap()->FindCodeObject(pc()));
+}
+
+
+Address StubFrame::GetCallerStackPointer() const {
+  return fp() + ExitFrameConstants::kCallerSPDisplacement;
+}
+
+
+int StubFrame::GetNumberOfIncomingArguments() const {
+  return 0;
 }
 
 
 void OptimizedFrame::Iterate(ObjectVisitor* v) const {
-  CompiledFrame::Iterate(v);
+#ifdef DEBUG
+  // Make sure that optimized frames do not contain any stack handlers.
+  StackHandlerIterator it(this, top_handler());
+  ASSERT(it.done());
+#endif
+
+  IterateCompiledFrame(v);
 
   // Visit the context and the function.
   Object** fixed_base = &Memory::Object_at(