Disallow garbage collection at another site in the LoadCallback ICs....

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
===================================================================
--- src/ia32/macro-assembler-ia32.h	(revision 3500)
+++ src/ia32/macro-assembler-ia32.h	(working copy)
@@ -319,9 +319,17 @@
   // Eventually this should be used for all C calls.
   void CallRuntime(Runtime::Function* f, int num_arguments);
 
+  // Call a runtime function, returning the RuntimeStub object called.
+  // Try to generate the stub code if necessary.  Do not perform a GC
+  // but instead return a retry after GC failure.
+  Object* TryCallRuntime(Runtime::Function* f, int num_arguments);
+
   // Convenience function: Same as above, but takes the fid instead.
   void CallRuntime(Runtime::FunctionId id, int num_arguments);
 
+  // Convenience function: Same as above, but takes the fid instead.
+  Object* TryCallRuntime(Runtime::FunctionId id, int num_arguments);
+
   // Tail call of a runtime routine (jump).
   // Like JumpToRuntime, but also takes care of passing the number
   // of arguments.
@@ -335,6 +343,10 @@
   // ensuring that saved register, it is not no_reg, is left unchanged.
   void PopHandleScope(Register saved, Register scratch);
 
+  // As PopHandleScope, but does not perform a GC.  Instead, returns a
+  // retry after GC failure object if GC is necessary.
+  Object* TryPopHandleScope(Register saved, Register scratch);
+
   // Jump to a runtime routine.
   void JumpToRuntime(const ExternalReference& ext);
 
@@ -427,6 +439,13 @@
                                Register scratch,
                                AllocationFlags flags);
   void UpdateAllocationTopHelper(Register result_end, Register scratch);
+
+  // Helper for PopHandleScope.  Allowed to perform a GC and returns
+  // NULL if gc_allowed.  Does not perform a GC if !gc_allowed, and
+  // possibly returns a failure object indicating an allocation failure.
+  Object* PopHandleScopeHelper(Register saved,
+                               Register scratch,
+                               bool gc_allowed);
 };