[crankshaft] Range analysis should not rely on overflowed ranges.

src/crankshaft/hydrogen-instructions.h

 // Copyright 2012 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.
 
 #ifndef V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_
 #define V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_
 
 #include <cstring>
 #include <iosfwd>
 
@@ skipping 217 matching lines @@
   bool IsMostGeneric() const {
     return lower_ == kMinInt && upper_ == kMaxInt && CanBeMinusZero();
   }
   bool IsInSmiRange() const {
     return lower_ >= Smi::kMinValue && upper_ <= Smi::kMaxValue;
   }
   void ClampToSmi() {
     lower_ = Max(lower_, Smi::kMinValue);
     upper_ = Min(upper_, Smi::kMaxValue);
   }
+  void Clear();
   void KeepOrder();
 #ifdef DEBUG
   void Verify() const;
 #endif
 
   void StackUpon(Range* other) {
     Intersect(other);
     next_ = other;
   }
 
@@ skipping 6700 matching lines @@
   bool IsDeletable() const override { return true; }
 };
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_