Fix some out-of-line constant pool garbage collection bugs.

src/x64/frames-x64.h

Index: src/x64/frames-x64.h
diff --git a/src/x64/frames-x64.h b/src/x64/frames-x64.h
index fb17964adae7abb03b462ccb40bc61bfd7d98817..6eb02a9179c64f3fca37202878b2765c3041071e 100644
--- a/src/x64/frames-x64.h
+++ b/src/x64/frames-x64.h
@@ -66,6 +66,8 @@ class EntryFrameConstants : public AllStatic {
 
 class ExitFrameConstants : public AllStatic {
  public:
+  static const int kFrameSize       = 2 * kPointerSize;
+
   static const int kCodeOffset      = -2 * kPointerSize;
   static const int kSPOffset        = -1 * kPointerSize;