[builtins] FastNewClosureStub becomes a builtin.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 925ad1e631b1d3a47d2976d5612ef6942ba2018e..a94cbf82935f6de012fa9e87fc85df6fccdb58ee 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -102,7 +102,6 @@ class Node;
   V(FastCloneRegExp)                          \
   V(FastCloneShallowArray)                    \
   V(FastCloneShallowObject)                   \
-  V(FastNewClosure)                           \
   V(FastNewFunctionContext)                   \
   V(KeyedLoadSloppyArguments)                 \
   V(KeyedStoreSloppyArguments)                \
@@ -788,18 +787,6 @@ class NumberToStringStub final : public TurboFanCodeStub {
   DEFINE_TURBOFAN_CODE_STUB(NumberToString, TurboFanCodeStub);
 };
 
-class FastNewClosureStub : public TurboFanCodeStub {
- public:
-  explicit FastNewClosureStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
-
-  static compiler::Node* Generate(CodeStubAssembler* assembler,
-                                  compiler::Node* shared_info,
-                                  compiler::Node* context);
-
-  DEFINE_CALL_INTERFACE_DESCRIPTOR(FastNewClosure);
-  DEFINE_TURBOFAN_CODE_STUB(FastNewClosure, TurboFanCodeStub);
-};
-
 class FastNewFunctionContextStub final : public TurboFanCodeStub {
  public:
   static int MaximumSlots();