Refactored custom call IC generators:

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
diff --git a/src/x64/stub-cache-x64.cc b/src/x64/stub-cache-x64.cc
index 7d4410cb00fe28391ee6b95b2be091eef2330a4c..dbe1c28e4fe81e9dde0eb358af0f5708927926e0 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -870,9 +870,9 @@ Object* CallStubCompiler::CompileCallConstant(Object* object,
 
   SharedFunctionInfo* function_info = function->shared();
   if (function_info->HasCustomCallGenerator()) {
-    CustomCallGenerator generator =
-        ToCData<CustomCallGenerator>(function_info->function_data());
-    Object* result = generator(this, object, holder, function, name, check);
+    const int id = function_info->custom_call_generator_id();
+    Object* result =
+        CompileCustomCall(id, object, holder, function, name, check);
     // undefined means bail out to regular compiler.
     if (!result->IsUndefined()) {
       return result;
@@ -1007,11 +1007,7 @@ Object* CallStubCompiler::CompileCallConstant(Object* object,
   __ Jump(ic, RelocInfo::CODE_TARGET);
 
   // Return the generated code.
-  String* function_name = NULL;
-  if (function->shared()->name()->IsString()) {
-    function_name = String::cast(function->shared()->name());
-  }
-  return GetCode(CONSTANT_FUNCTION, function_name);
+  return GetCode(function);
 }
 
 
@@ -1219,11 +1215,7 @@ Object* CallStubCompiler::CompileArrayPushCall(Object* object,
   __ jmp(ic, RelocInfo::CODE_TARGET);
 
   // Return the generated code.
-  String* function_name = NULL;
-  if (function->shared()->name()->IsString()) {
-    function_name = String::cast(function->shared()->name());
-  }
-  return GetCode(CONSTANT_FUNCTION, function_name);
+  return GetCode(function);
 }
 
 
@@ -1308,11 +1300,7 @@ Object* CallStubCompiler::CompileArrayPopCall(Object* object,
   __ jmp(ic, RelocInfo::CODE_TARGET);
 
   // Return the generated code.
-  String* function_name = NULL;
-  if (function->shared()->name()->IsString()) {
-    function_name = String::cast(function->shared()->name());
-  }
-  return GetCode(CONSTANT_FUNCTION, function_name);
+  return GetCode(function);
 }