[turbofan] Address the useless overflow bit materialization.

src/compiler/typer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/typer.h"
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/common-operator.h"
@@ skipping 2000 matching lines @@
 Type* Typer::Visitor::TypeCheckTaggedPointer(Node* node) {
   Type* arg = Operand(node, 0);
   return Type::Intersect(arg, Type::TaggedPointer(), zone());
 }
 
 Type* Typer::Visitor::TypeCheckTaggedSigned(Node* node) {
   Type* arg = Operand(node, 0);
   return Type::Intersect(arg, typer_->cache_.kSmi, zone());
 }
 
+Type* Typer::Visitor::TypeCheckedInt32Add(Node* node) {
+  return Type::Integral32();
+}
+
+Type* Typer::Visitor::TypeCheckedInt32Sub(Node* node) {
+  return Type::Integral32();
+}
+
 Type* Typer::Visitor::TypeCheckedUint32ToInt32(Node* node) {
   return Type::Signed32();
 }
 
 Type* Typer::Visitor::TypeCheckedFloat64ToInt32(Node* node) {
   return Type::Signed32();
 }
 
 Type* Typer::Visitor::TypeCheckedTaggedToInt32(Node* node) {
   return Type::Signed32();
@@ skipping 19 matching lines @@
       break;
     }
     case CheckTaggedHoleMode::kNeverReturnHole: {
       // We deoptimize in case of the hole.
       break;
     }
   }
   return type;
 }
 
-Type* Typer::Visitor::TypeCheckIf(Node* node) {
-  UNREACHABLE();
-  return nullptr;
-}
-
 Type* Typer::Visitor::TypeTruncateTaggedToWord32(Node* node) {
   Type* arg = Operand(node, 0);
   // TODO(jarin): DCHECK(arg->Is(Type::NumberOrUndefined()));
   // Several mjsunit and cctest tests fail this check. For instance,
   // mjsunit/compiler/regress-607493 fails with Any/Any in simplified-lowering
   // (after propagation).
   return ChangeRepresentation(arg, Type::UntaggedIntegral32(), zone());
 }
 
 Type* Typer::Visitor::TypeAllocate(Node* node) { return Type::TaggedPointer(); }
@@ skipping 719 matching lines @@
   }
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8