Revert of [arm64] A shift of 0 is not allowed in ubfx.

test/cctest/compiler/test-run-machops.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 <cmath>
 #include <functional>
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/base/ieee754.h"
@@ skipping 6712 matching lines @@
   {
     BufferedRawMachineAssemblerTester<int64_t> m(MachineType::Int64());
     m.Return(m.Int64Add(
         m.Parameter(0),
         m.Word64Shr(m.Parameter(0), m.Int64Constant(4611686018427387888))));
     int64_t input = 16;
     m.Call(input);
   }
 }
 
-TEST(Regression5951) {
-  BufferedRawMachineAssemblerTester<int64_t> m(MachineType::Int64());
-  m.Return(m.Word64And(m.Word64Shr(m.Parameter(0), m.Int64Constant(0)),
-                       m.Int64Constant(0xffffffffffffffffl)));
-  int64_t input = 1234;
-  CHECK_EQ(input, m.Call(input));
-}
-
 #endif  // V8_TARGET_ARCH_64_BIT
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8