Remove indirection when calling Runtime_StackGuard.

src/x64/full-codegen-x64.cc

Index: src/x64/full-codegen-x64.cc
diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
index c182dd0ce5800d8db1247fcdf9d4490c0881e6ca..6df6fd46a6db6fe167516c4deb929e08eda2d938 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -280,7 +280,7 @@ void FullCodeGenerator::Generate() {
       Label ok;
       __ CompareRoot(rsp, Heap::kStackLimitRootIndex);
       __ j(above_equal, &ok, Label::kNear);
-      __ call(isolate()->builtins()->StackCheck(), RelocInfo::CODE_TARGET);
+      __ CallRuntime(Runtime::kStackCheck, 0);
       __ bind(&ok);
     }
 
@@ -386,8 +386,7 @@ void FullCodeGenerator::EmitReturnSequence() {
         __ push(Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
         __ CallRuntime(Runtime::kOptimizeFunctionOnNextCall, 1);
       } else {
-        __ call(isolate()->builtins()->InterruptCheck(),
-                RelocInfo::CODE_TARGET);
+        __ CallRuntime(Runtime::kInterrupt, 0);
       }
       __ pop(rax);
       EmitProfilingCounterReset();