[arm][arm64] Improve CountTrailingZero implementation.

src/compiler/arm64/instruction-codes-arm64.h

 // 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.
 
 #ifndef V8_COMPILER_ARM64_INSTRUCTION_CODES_ARM64_H_
 #define V8_COMPILER_ARM64_INSTRUCTION_CODES_ARM64_H_
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 55 matching lines @@
   V(Arm64Ror32)                    \
   V(Arm64Mov32)                    \
   V(Arm64Sxtb32)                   \
   V(Arm64Sxth32)                   \
   V(Arm64Sxtw)                     \
   V(Arm64Sbfx32)                   \
   V(Arm64Ubfx)                     \
   V(Arm64Ubfx32)                   \
   V(Arm64Ubfiz32)                  \
   V(Arm64Bfi)                      \
+  V(Arm64Rbit)                     \
+  V(Arm64Rbit32)                   \
   V(Arm64TestAndBranch32)          \
   V(Arm64TestAndBranch)            \
   V(Arm64CompareAndBranch32)       \
   V(Arm64ClaimCSP)                 \
   V(Arm64ClaimJSSP)                \
   V(Arm64PokeCSP)                  \
   V(Arm64PokeJSSP)                 \
   V(Arm64PokePair)                 \
   V(Arm64Float32Cmp)               \
   V(Arm64Float32Add)               \
@@ skipping 56 matching lines @@
   V(Arm64Ldrsb)                    \
   V(Arm64Strb)                     \
   V(Arm64Ldrh)                     \
   V(Arm64Ldrsh)                    \
   V(Arm64Strh)                     \
   V(Arm64LdrW)                     \
   V(Arm64StrW)                     \
   V(Arm64Ldr)                      \
   V(Arm64Str)
 
-
 // Addressing modes represent the "shape" of inputs to an instruction.
 // Many instructions support multiple addressing modes. Addressing modes
 // are encoded into the InstructionCode of the instruction and tell the
 // code generator after register allocation which assembler method to call.
 //
 // We use the following local notation for addressing modes:
 //
 // R = register
 // O = register or stack slot
 // D = double register
@@ skipping 12 matching lines @@
   V(Operand2_R_SXTB)  /* %r0 SXTB (signed extend byte) */       \
   V(Operand2_R_SXTH)  /* %r0 SXTH (signed extend halfword) */
 
 enum ResetJSSPAfterCall { kNoResetJSSP, kResetJSSP };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_ARM64_INSTRUCTION_CODES_ARM64_H_