Adds the possibility of setting a Code object as the callback of a FunctionTemplate.

src/ic/x87/handler-compiler-x87.cc

Index: src/ic/x87/handler-compiler-x87.cc
diff --git a/src/ic/x87/handler-compiler-x87.cc b/src/ic/x87/handler-compiler-x87.cc
index 3c3f18699221e2de828c0096d07160b4770b52ae..ba6e0327be4d34673a0d044dba5e182b5662f160 100644
--- a/src/ic/x87/handler-compiler-x87.cc
+++ b/src/ic/x87/handler-compiler-x87.cc
@@ -206,6 +206,12 @@ void PropertyHandlerCompiler::GenerateApiAccessorCall(
     __ mov(data, FieldOperand(data, CallHandlerInfo::kDataOffset));
   }
 
+  if (api_call_info->fast_handler()->IsCode()) {
+    // Just tail call into the code.
+    __ Jump(handle(Code::cast(api_call_info->fast_handler())),
+            RelocInfo::CODE_TARGET);
+    return;
+  }
   // Put api_function_address in place.
   Address function_address = v8::ToCData<Address>(api_call_info->callback());
   __ mov(api_function_address, Immediate(function_address));