Revert "Convert UnaryOpStub to a HydrogenCodeStub"

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index f7e006bcb2fcb022d227508c32227a9f30966416..95a44f038427f1145aa47563af3f023f0c1face2 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -1911,18 +1911,6 @@ LInstruction* LChunkBuilder::DoCheckHeapObject(HCheckHeapObject* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoCheckSmi(HCheckSmi* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return AssignEnvironment(new(zone()) LCheckSmi(value));
-}
-
-
-LInstruction* LChunkBuilder::DoIsNumberAndBranch(HIsNumberAndBranch* instr) {
-  return new(zone()) LIsNumberAndBranch(
-      UseRegisterOrConstantAtStart(instr->value()));
-}
-
-
 LInstruction* LChunkBuilder::DoCheckInstanceType(HCheckInstanceType* instr) {
   LOperand* value = UseRegisterAtStart(instr->value());
   LCheckInstanceType* result = new(zone()) LCheckInstanceType(value);