[turbofan] Optimize certain chains of Branch into a Switch.

src/compiler/instruction-codes.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_INSTRUCTION_CODES_H_
 #define V8_COMPILER_INSTRUCTION_CODES_H_
 
 #include <iosfwd>
 
 #if V8_TARGET_ARCH_ARM
@@ skipping 19 matching lines @@
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // Target-specific opcodes that specify which assembly sequence to emit.
 // Most opcodes specify a single instruction.
 #define ARCH_OPCODE_LIST(V) \
   V(ArchCallCodeObject)     \
   V(ArchCallJSFunction)     \
   V(ArchJmp)                \
-  V(ArchSwitch)             \
+  V(ArchLookupSwitch)       \
+  V(ArchTableSwitch)        \
   V(ArchNop)                \
   V(ArchRet)                \
   V(ArchStackPointer)       \
   V(ArchTruncateDoubleToI)  \
   V(CheckedLoadInt8)        \
   V(CheckedLoadUint8)       \
   V(CheckedLoadInt16)       \
   V(CheckedLoadUint16)      \
   V(CheckedLoadWord32)      \
   V(CheckedLoadFloat32)     \
@@ skipping 78 matching lines @@
 typedef BitField<AddressingMode, 7, 5> AddressingModeField;
 typedef BitField<FlagsMode, 12, 2> FlagsModeField;
 typedef BitField<FlagsCondition, 14, 4> FlagsConditionField;
 typedef BitField<int, 14, 18> MiscField;
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_CODES_H_