[builtins] Sanitize the machinery around Construct calls.

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

 // Copyright 2012 the V8 project authors. All rights reserved.7
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3800 matching lines @@
     Handle<Code> ic =
         CodeFactory::CallICInOptimizedCode(isolate(), arity, mode).code();
     CallCode(ic, RelocInfo::CODE_TARGET, instr);
   } else {
     __ li(a0, Operand(arity));
     CallCode(isolate()->builtins()->Call(mode), RelocInfo::CODE_TARGET, instr);
   }
 }
 
 
-void LCodeGen::DoCallNew(LCallNew* instr) {
-  DCHECK(ToRegister(instr->context()).is(cp));
-  DCHECK(ToRegister(instr->constructor()).is(a1));
-  DCHECK(ToRegister(instr->result()).is(v0));
-
-  __ li(a0, Operand(instr->arity()));
-  // No cell in a2 for construct type feedback in optimized code
-  __ LoadRoot(a2, 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(cp));
   DCHECK(ToRegister(instr->constructor()).is(a1));
   DCHECK(ToRegister(instr->result()).is(v0));
 
   __ li(a0, Operand(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 1987 matching lines @@
   __ Push(at, ToRegister(instr->function()));
   CallRuntime(Runtime::kPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8