[builtins] Sanitize the machinery around Construct calls.

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

Index: src/crankshaft/mips/lithium-codegen-mips.cc
diff --git a/src/crankshaft/mips/lithium-codegen-mips.cc b/src/crankshaft/mips/lithium-codegen-mips.cc
index fe0c1880ad66f84b8a1673ef33c41eb37af2653f..447b88b643298e4ab34b428086036b2bf4b8c7f0 100644
--- a/src/crankshaft/mips/lithium-codegen-mips.cc
+++ b/src/crankshaft/mips/lithium-codegen-mips.cc
@@ -3818,19 +3818,6 @@ 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));