ARM64: Use the shifter operand to merge in previous shift instructions.

src/arm64/constants-arm64.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_ARM64_CONSTANTS_ARM64_H_
 #define V8_ARM64_CONSTANTS_ARM64_H_
 
 
 // Assert that this is an LP64 system.
 STATIC_ASSERT(sizeof(int) == sizeof(int32_t));     // NOLINT(runtime/sizeof)
@@ skipping 71 matching lines @@
 const int64_t kXMaxInt = 0x7fffffffffffffffL;
 const int64_t kXMinInt = 0x8000000000000000L;
 const int32_t kWMaxInt = 0x7fffffff;
 const int32_t kWMinInt = 0x80000000;
 const unsigned kFramePointerRegCode = 29;
 const unsigned kLinkRegCode = 30;
 const unsigned kZeroRegCode = 31;
 const unsigned kJSSPCode = 28;
 const unsigned kSPRegInternalCode = 63;
 const unsigned kRegCodeMask = 0x1f;
+const unsigned kShiftAmountWRegMask = 0x1f;
+const unsigned kShiftAmountXRegMask = 0x3f;
 // Standard machine types defined by AAPCS64.
 const unsigned kByteSize = 8;
 const unsigned kByteSizeInBytes = kByteSize >> 3;
 const unsigned kHalfWordSize = 16;
 const unsigned kHalfWordSizeLog2 = 4;
 const unsigned kHalfWordSizeInBytes = kHalfWordSize >> 3;
 const unsigned kHalfWordSizeInBytesLog2 = kHalfWordSizeLog2 - 3;
 const unsigned kWordSize = 32;
 const unsigned kWordSizeLog2 = 5;
 const unsigned kWordSizeInBytes = kWordSize >> 3;
@@ skipping 1138 matching lines @@
 };
 
 enum UnallocatedOp {
   UnallocatedFixed = 0x00000000,
   UnallocatedFMask = 0x00000000
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_CONSTANTS_ARM64_H_