Tighten up assertions checking GC-safety of stub calls.

src/ia32/code-stubs-ia32.h

Index: src/ia32/code-stubs-ia32.h
diff --git a/src/ia32/code-stubs-ia32.h b/src/ia32/code-stubs-ia32.h
index ab509b7277c3ff6ff2b878f23f5a91a9b3d6e4e7..498fe57f3660681359d118ca376d251b3b47ddf9 100644
--- a/src/ia32/code-stubs-ia32.h
+++ b/src/ia32/code-stubs-ia32.h
@@ -67,7 +67,7 @@ class StoreBufferOverflowStub: public CodeStub {
 
   void Generate(MacroAssembler* masm);
 
-  virtual bool CompilingCallsToThisStubIsGCSafe() { return true; }
+  virtual bool IsPregenerated() { return true; }
   static void GenerateFixedRegStubsAheadOfTime();
   virtual bool SometimesSetsUpAFrame() { return false; }
 
@@ -495,7 +495,7 @@ class RecordWriteStub: public CodeStub {
     INCREMENTAL_COMPACTION
   };
 
-  virtual bool CompilingCallsToThisStubIsGCSafe();
+  virtual bool IsPregenerated();
   static void GenerateFixedRegStubsAheadOfTime();
   virtual bool SometimesSetsUpAFrame() { return false; }