Introduce a BuiltinsConstructStub that sets up new.target and does a [[call]] per ES6 9.3.2

src/regexp/jsregexp.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/regexp/jsregexp.h"
 
 #include "src/ast.h"
 #include "src/base/platform/platform.h"
 #include "src/compilation-cache.h"
 #include "src/compiler.h"
@@ skipping 33 matching lines @@
 #include "src/regexp/x87/regexp-macro-assembler-x87.h"
 #else
 #error Unsupported target architecture.
 #endif
 #endif
 
 
 namespace v8 {
 namespace internal {
 
-MaybeHandle<Object> RegExpImpl::CreateRegExpLiteral(
-    Handle<JSFunction> constructor,
-    Handle<String> pattern,
-    Handle<String> flags) {
-  // Call the construct code with 2 arguments.
-  Handle<Object> argv[] = { pattern, flags };
-  return Execution::New(constructor, arraysize(argv), argv);
-}
-
-
 MUST_USE_RESULT
 static inline MaybeHandle<Object> ThrowRegExpException(
     Handle<JSRegExp> re, Handle<String> pattern, Handle<String> error_text) {
   Isolate* isolate = re->GetIsolate();
   THROW_NEW_ERROR(isolate, NewSyntaxError(MessageTemplate::kMalformedRegExp,
                                           pattern, error_text),
                   Object);
 }
 
 
@@ skipping 6438 matching lines @@
 
 
 void RegExpResultsCache::Clear(FixedArray* cache) {
   for (int i = 0; i < kRegExpResultsCacheSize; i++) {
     cache->set(i, Smi::FromInt(0));
   }
 }
 
 }  // namespace internal
 }  // namespace v8