[arm][arm64] Improve CountTrailingZero implementation.

src/compiler/arm/instruction-scheduler-arm.cc

 // Copyright 2015 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 "src/compiler/instruction-scheduler.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 28 matching lines @@
     case kArmBfc:
     case kArmUbfx:
     case kArmSxtb:
     case kArmSxth:
     case kArmSxtab:
     case kArmSxtah:
     case kArmUxtb:
     case kArmUxth:
     case kArmUxtab:
     case kArmUxtah:
+    case kArmRbit:
     case kArmVcmpF32:
     case kArmVaddF32:
     case kArmVsubF32:
     case kArmVmulF32:
     case kArmVmlaF32:
     case kArmVmlsF32:
     case kArmVdivF32:
     case kArmVabsF32:
     case kArmVnegF32:
     case kArmVsqrtF32:
@@ skipping 65 matching lines @@
 
 
 int InstructionScheduler::GetInstructionLatency(const Instruction* instr) {
   // TODO(all): Add instruction cost modeling.
   return 1;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8