Turn FastNewContextStub into a HydrogenCodeStub.

src/code-stubs.cc

Index: src/code-stubs.cc
diff --git a/src/code-stubs.cc b/src/code-stubs.cc
index c5e00ea44cff454a951b89e29973a0b9f98d29ee..a2da8031a4ad73479f43e773ffcf469a3366e0e9 100644
--- a/src/code-stubs.cc
+++ b/src/code-stubs.cc
@@ -766,6 +766,12 @@ void FastNewClosureStub::InstallDescriptors(Isolate* isolate) {
 }
 
 
+void FastNewContextStub::InstallDescriptors(Isolate* isolate) {
+  FastNewContextStub stub(FastNewContextStub::kMaximumSlots);
+  InstallDescriptor(isolate, &stub);
+}
+
+
 // static
 void BinaryOpICStub::InstallDescriptors(Isolate* isolate) {
   BinaryOpICStub stub(Token::ADD, NO_OVERWRITE);