Support fast case for-in in Crankshaft.

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index ae9bb5a1f0132dfd6964539ab825c7330979863d..66d1ce7d3851d246d4417b2f92654430f7a417f4 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -829,6 +829,10 @@ class MacroAssembler: public Assembler {
   void EnterFrame(StackFrame::Type type);
   void LeaveFrame(StackFrame::Type type);
 
+  // Expects object in eax and returns map with validated enum cache
+  // in eax.  Assumes that any other register can be used as a scratch.
+  void CheckEnumCache(Label* call_runtime);
+
  private:
   bool generating_stub_;
   bool allow_stub_calls_;