[builtins] Sanitize the machinery around Construct calls.

src/crankshaft/x64/lithium-codegen-x64.cc

 // Copyright 2013 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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/crankshaft/x64/lithium-codegen-x64.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 3852 matching lines @@
     Handle<Code> ic =
         CodeFactory::CallICInOptimizedCode(isolate(), arity, mode).code();
     CallCode(ic, RelocInfo::CODE_TARGET, instr);
   } else {
     __ Set(rax, arity);
     CallCode(isolate()->builtins()->Call(mode), RelocInfo::CODE_TARGET, instr);
   }
 }
 
 
-void LCodeGen::DoCallNew(LCallNew* instr) {
-  DCHECK(ToRegister(instr->context()).is(rsi));
-  DCHECK(ToRegister(instr->constructor()).is(rdi));
-  DCHECK(ToRegister(instr->result()).is(rax));
-
-  __ Set(rax, instr->arity());
-  // No cell in ebx for construct type feedback in optimized code
-  __ LoadRoot(rbx, Heap::kUndefinedValueRootIndex);
-  CallConstructStub stub(isolate(), NO_CALL_CONSTRUCTOR_FLAGS);
-  CallCode(stub.GetCode(), RelocInfo::CONSTRUCT_CALL, instr);
-}
-
-
 void LCodeGen::DoCallNewArray(LCallNewArray* instr) {
   DCHECK(ToRegister(instr->context()).is(rsi));
   DCHECK(ToRegister(instr->constructor()).is(rdi));
   DCHECK(ToRegister(instr->result()).is(rax));
 
   __ Set(rax, instr->arity());
   if (instr->arity() == 1) {
     // We only need the allocation site for the case we have a length argument.
     // The case may bail out to the runtime, which will determine the correct
     // elements kind with the site.
@@ skipping 1956 matching lines @@
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64