Remove separate construct stub for new.target users.

src/builtins.h

Index: src/builtins.h
diff --git a/src/builtins.h b/src/builtins.h
index e1e202b3f724cabca5529a821d3d6e6fdbec8838..e3cfb0c3d854589fa443893ae39cd59b16fad0c2 100644
--- a/src/builtins.h
+++ b/src/builtins.h
@@ -70,7 +70,6 @@ enum BuiltinExtraArguments {
   V(JSConstructStubGeneric, BUILTIN, UNINITIALIZED, kNoExtraICState)         \
   V(JSConstructStubForDerived, BUILTIN, UNINITIALIZED, kNoExtraICState)      \
   V(JSConstructStubApi, BUILTIN, UNINITIALIZED, kNoExtraICState)             \
-  V(JSConstructStubNewTarget, BUILTIN, UNINITIALIZED, kNoExtraICState)       \
   V(JSEntryTrampoline, BUILTIN, UNINITIALIZED, kNoExtraICState)              \
   V(JSConstructEntryTrampoline, BUILTIN, UNINITIALIZED, kNoExtraICState)     \
   V(CompileLazy, BUILTIN, UNINITIALIZED, kNoExtraICState)                    \
@@ -317,7 +316,6 @@ class Builtins {
   static void Generate_JSConstructStubGeneric(MacroAssembler* masm);
   static void Generate_JSConstructStubForDerived(MacroAssembler* masm);
   static void Generate_JSConstructStubApi(MacroAssembler* masm);
-  static void Generate_JSConstructStubNewTarget(MacroAssembler* masm);
   static void Generate_JSEntryTrampoline(MacroAssembler* masm);
   static void Generate_JSConstructEntryTrampoline(MacroAssembler* masm);
   static void Generate_NotifyDeoptimized(MacroAssembler* masm);