Turn RegExpConstructResultStub into a HydrogenCodeStub.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 8074366c72e2eb158dd7986b0403fd5436a37288..da96eb24c9af151f22863d090891aa3ca8d6f4f9 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -1031,11 +1031,6 @@ void LCodeGen::DoCallStub(LCallStub* instr) {
   ASSERT(ToRegister(instr->context()).is(cp));
   ASSERT(ToRegister(instr->result()).is(v0));
   switch (instr->hydrogen()->major_key()) {
-    case CodeStub::RegExpConstructResult: {
-      RegExpConstructResultStub stub;
-      CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
-      break;
-    }
     case CodeStub::RegExpExec: {
       RegExpExecStub stub;
       CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);