Fix compilation error with latest Xcode.

src/ia32/stub-cache-ia32.cc

Index: src/ia32/stub-cache-ia32.cc
diff --git a/src/ia32/stub-cache-ia32.cc b/src/ia32/stub-cache-ia32.cc
index 5c81b593d0ee94c03be186fad6b6351c7c6b2b70..ba57d7e1177f1ea99f783c991a361d8992304dbb 100644
--- a/src/ia32/stub-cache-ia32.cc
+++ b/src/ia32/stub-cache-ia32.cc
@@ -651,8 +651,7 @@ class CallInterceptorCompiler BASE_EMBEDDED {
                           ExtraICState extra_state)
       : stub_compiler_(stub_compiler),
         arguments_(arguments),
-        name_(name),
-        extra_state_(extra_state) {}
+        name_(name) {}
 
   void Compile(MacroAssembler* masm,
                Handle<JSObject> object,
@@ -828,7 +827,6 @@ class CallInterceptorCompiler BASE_EMBEDDED {
   CallStubCompiler* stub_compiler_;
   const ParameterCount& arguments_;
   Register name_;
-  ExtraICState extra_state_;
 };