[builtins] Sanitize the machinery around Construct calls.

src/crankshaft/mips64/lithium-codegen-mips64.cc

Index: src/crankshaft/mips64/lithium-codegen-mips64.cc
diff --git a/src/crankshaft/mips64/lithium-codegen-mips64.cc b/src/crankshaft/mips64/lithium-codegen-mips64.cc
index 22650ee9fec1447691c561fcb4c4e0ddce8779a6..810e02bd04a449fe7278935e718e4375965b8f77 100644
--- a/src/crankshaft/mips64/lithium-codegen-mips64.cc
+++ b/src/crankshaft/mips64/lithium-codegen-mips64.cc
@@ -4006,19 +4006,6 @@ void LCodeGen::DoCallFunction(LCallFunction* 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));