[Isolates] Merge (7083,7111] from bleeding_edge.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 96ac7335cfa86f51eb3e41905d4accbfeb7127d2..f9f7b82382ad60457deb315c47b13f5c97e563e9 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -167,7 +167,11 @@ class CodeStub BASE_EMBEDDED {
   // Returns a name for logging/debugging purposes.
   virtual const char* GetName() { return MajorName(MajorKey(), false); }
 
-#ifdef DEBUG
+  // Returns whether the code generated for this stub needs to be allocated as
+  // a fixed (non-moveable) code object.
+  virtual bool NeedsImmovableCode() { return false; }
+
+  #ifdef DEBUG
   virtual void Print() { PrintF("%s\n", GetName()); }
 #endif
 
@@ -623,6 +627,8 @@ class CEntryStub : public CodeStub {
   Major MajorKey() { return CEntry; }
   int MinorKey();
 
+  bool NeedsImmovableCode();
+
   const char* GetName() { return "CEntryStub"; }
 };