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

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

Index: src/ic/mips/handler-compiler-mips.cc
diff --git a/src/ic/mips/handler-compiler-mips.cc b/src/ic/mips/handler-compiler-mips.cc
index 0a21f9e6a18b83480785fb3681b5160692d1aa24..c80581244cafd238f56e6e5bacdcad9f7c0f1f99 100644
--- a/src/ic/mips/handler-compiler-mips.cc
+++ b/src/ic/mips/handler-compiler-mips.cc
@@ -283,6 +283,13 @@ void PropertyHandlerCompiler::GenerateApiAccessorCall(
     __ lw(data, FieldMemOperand(data, FunctionTemplateInfo::kCallCodeOffset));
     __ lw(data, FieldMemOperand(data, CallHandlerInfo::kDataOffset));
   }
+
+  if (api_call_info->fast_handler()->IsCode()) {
+    // Just tail call into the fast handler if present.
+    __ 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());
   ApiFunction fun(function_address);