Support profiler stack sampling in any situation.

src/frames-ia32.h

Index: src/frames-ia32.h
diff --git a/src/frames-ia32.h b/src/frames-ia32.h
index e31906de3b82eb9425cd40a6ee8b5a1d61c23990..518b1ca553b409e5a6408ee7fb0eb562be620687 100644
--- a/src/frames-ia32.h
+++ b/src/frames-ia32.h
@@ -129,11 +129,9 @@ class InternalFrameConstants : public AllStatic {
 };
 
 
-inline Object* JavaScriptFrame::function() const {
+inline Object* JavaScriptFrame::function_slot_object() const {
   const int offset = JavaScriptFrameConstants::kFunctionOffset;
-  Object* result = Memory::Object_at(fp() + offset);
-  ASSERT(result->IsJSFunction());
-  return result;
+  return Memory::Object_at(fp() + offset);
 }