[turbofan] Turn Math.clz32 into an inlinable builtin.

src/compiler/instruction-selector.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 "src/compiler/instruction-selector.h"
 
 #include <limits>
 
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 640 matching lines @@
     case IrOpcode::kWord32Shl:
       return VisitWord32Shl(node);
     case IrOpcode::kWord32Shr:
       return VisitWord32Shr(node);
     case IrOpcode::kWord32Sar:
       return VisitWord32Sar(node);
     case IrOpcode::kWord32Ror:
       return VisitWord32Ror(node);
     case IrOpcode::kWord32Equal:
       return VisitWord32Equal(node);
+    case IrOpcode::kWord32Clz:
+      return VisitWord32Clz(node);
     case IrOpcode::kWord64And:
       return VisitWord64And(node);
     case IrOpcode::kWord64Or:
       return VisitWord64Or(node);
     case IrOpcode::kWord64Xor:
       return VisitWord64Xor(node);
     case IrOpcode::kWord64Shl:
       return VisitWord64Shl(node);
     case IrOpcode::kWord64Shr:
       return VisitWord64Shr(node);
@@ skipping 451 matching lines @@
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
   return MachineOperatorBuilder::Flag::kNoFlags;
 }
 
 #endif  // !V8_TURBOFAN_BACKEND
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8