[turbofan] Avoid overflow checks on SpeculativeNumberAdd/Subtract/Multiply.

src/compiler/representation-change.h

Index: src/compiler/representation-change.h
diff --git a/src/compiler/representation-change.h b/src/compiler/representation-change.h
index 9f50d2aa60b83c797c011763f7d206e9c76a9800..3554e6aa48888e3fbc46d979ae5744476d205f8e 100644
--- a/src/compiler/representation-change.h
+++ b/src/compiler/representation-change.h
@@ -35,6 +35,10 @@ class Truncation final {
   bool IsUsedAsFloat64() const {
     return LessGeneral(kind_, TruncationKind::kFloat64);
   }
+  bool IdentifiesMinusZeroAndZero() {
+    return LessGeneral(kind_, TruncationKind::kWord32) ||
+           LessGeneral(kind_, TruncationKind::kBool);
+  }
   bool IdentifiesNaNAndZero() {
     return LessGeneral(kind_, TruncationKind::kWord32) ||
            LessGeneral(kind_, TruncationKind::kBool);