[builtins] FastNewFunctionContextStub becomes a builtin

src/crankshaft/mips/lithium-codegen-mips.cc

Index: src/crankshaft/mips/lithium-codegen-mips.cc
diff --git a/src/crankshaft/mips/lithium-codegen-mips.cc b/src/crankshaft/mips/lithium-codegen-mips.cc
index ad988b22128c598ddd5820ee566dbe35119b90d4..df2f3711850a24fbcabec6af7d45f76a6d92d437 100644
--- a/src/crankshaft/mips/lithium-codegen-mips.cc
+++ b/src/crankshaft/mips/lithium-codegen-mips.cc
@@ -28,6 +28,7 @@
 #include "src/crankshaft/mips/lithium-codegen-mips.h"
 
 #include "src/base/bits.h"
+#include "src/builtins/builtins-constructor.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/crankshaft/hydrogen-osr.h"
@@ -202,13 +203,14 @@ void LCodeGen::DoPrologue(LPrologue* instr) {
       __ CallRuntime(Runtime::kNewScriptContext);
       deopt_mode = Safepoint::kLazyDeopt;
     } else {
-      if (slots <= FastNewFunctionContextStub::MaximumSlots()) {
-        FastNewFunctionContextStub stub(isolate(),
-                                        info()->scope()->scope_type());
+      if (slots <=
+          ConstructorBuiltinsAssembler::MaximumFunctionContextSlots()) {
+        Callable callable = CodeFactory::FastNewFunctionContext(
+            isolate(), info()->scope()->scope_type());
         __ li(FastNewFunctionContextDescriptor::SlotsRegister(),
               Operand(slots));
-        __ CallStub(&stub);
-        // Result of FastNewFunctionContextStub is always in new space.
+        __ Call(callable.code(), RelocInfo::CODE_TARGET);
+        // Result of the FastNewFunctionContext builtin is always in new space.
         need_write_barrier = false;
       } else {
         __ push(a1);