Implemented "no heap access" mode for JSFrame which is used for stack sampling in profiler.

src/frames-ia32.cc

Index: src/frames-ia32.cc
diff --git a/src/frames-ia32.cc b/src/frames-ia32.cc
index 2b24777257bd23e1331a704fc13b25f5819e0d45..1bc62ec22621e960ded1d4361940f7012d481775 100644
--- a/src/frames-ia32.cc
+++ b/src/frames-ia32.cc
@@ -78,7 +78,7 @@ int JavaScriptFrame::GetProvidedParametersCount() const {
 
 Address JavaScriptFrame::GetCallerStackPointer() const {
   int arguments;
-  if (Heap::gc_state() != Heap::NOT_IN_GC) {
+  if (Heap::gc_state() != Heap::NOT_IN_GC || disable_heap_access_) {
     // The arguments for cooked frames are traversed as if they were
     // expression stack elements of the calling frame. The reason for
     // this rather strange decision is that we cannot access the