[turbofan] remove redundant '& 0x1F' for shifts.

src/compiler/machine-operator.h

 // Copyright 2013 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_COMPILER_MACHINE_OPERATOR_H_
 #define V8_COMPILER_MACHINE_OPERATOR_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/machine-type.h"
 
@@ skipping 49 matching lines @@
  public:
   // Flags that specify which operations are available. This is useful
   // for operations that are unsupported by some back-ends.
   enum Flag {
     kNoFlags = 0u,
     kFloat64Floor = 1u << 0,
     kFloat64Ceil = 1u << 1,
     kFloat64RoundTruncate = 1u << 2,
     kFloat64RoundTiesAway = 1u << 3,
     kInt32DivIsSafe = 1u << 4,
-    kUint32DivIsSafe = 1u << 5
+    kUint32DivIsSafe = 1u << 5,
+    kWord32ShiftIsSafe = 1u << 6
   };
   typedef base::Flags<Flag, unsigned> Flags;
 
   explicit MachineOperatorBuilder(Zone* zone, MachineType word = kMachPtr,
                                   Flags supportedOperators = kNoFlags);
 
   const Operator* Word32And();
   const Operator* Word32Or();
   const Operator* Word32Xor();
   const Operator* Word32Shl();
   const Operator* Word32Shr();
   const Operator* Word32Sar();
   const Operator* Word32Ror();
   const Operator* Word32Equal();
+  bool Word32ShiftIsSafe() const { return flags_ & kWord32ShiftIsSafe; }
 
   const Operator* Word64And();
   const Operator* Word64Or();
   const Operator* Word64Xor();
   const Operator* Word64Shl();
   const Operator* Word64Shr();
   const Operator* Word64Sar();
   const Operator* Word64Ror();
   const Operator* Word64Equal();
 
@@ skipping 119 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(MachineOperatorBuilder);
 };
 
 
 DEFINE_OPERATORS_FOR_FLAGS(MachineOperatorBuilder::Flags)
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_OPERATOR_H_