[turbofan] Drop V8_TURBOFAN_BACKEND and V8_TURBOFAN_TARGET defines.

src/globals.h

 // Copyright 2012 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_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 12 matching lines @@
 # include <limits>  // NOLINT
 # define V8_INFINITY std::numeric_limits<double>::infinity()
 #elif V8_LIBC_MSVCRT
 # define V8_INFINITY HUGE_VAL
 #elif V8_OS_AIX
 #define V8_INFINITY (__builtin_inff())
 #else
 # define V8_INFINITY INFINITY
 #endif
 
-#if V8_TARGET_ARCH_IA32 || (V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_32_BIT) || \
-    V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_MIPS ||     \
-    V8_TARGET_ARCH_MIPS64 || V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_X87
-
-#define V8_TURBOFAN_BACKEND 1
-#if V8_TARGET_ARCH_X64 || V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_MIPS64 || \
-    V8_TARGET_ARCH_PPC64
-// 64-bit TurboFan backends support 64-bit integer arithmetic.
-#define V8_TURBOFAN_BACKEND_64 1
-#else
-#define V8_TURBOFAN_BACKEND_64 0
-#endif
-
-#else
-#define V8_TURBOFAN_BACKEND 0
-#endif
-
-#if V8_TURBOFAN_BACKEND
-#define V8_TURBOFAN_TARGET 1
-#else
-#define V8_TURBOFAN_TARGET 0
-#endif
-
 namespace v8 {
 
 namespace base {
 class Mutex;
 class RecursiveMutex;
 class VirtualMemory;
 }
 
 namespace internal {
 
@@ skipping 964 matching lines @@
 inline FunctionKind WithObjectLiteralBit(FunctionKind kind) {
   kind = static_cast<FunctionKind>(kind | FunctionKind::kInObjectLiteral);
   DCHECK(IsValidFunctionKind(kind));
   return kind;
 }
 } }  // namespace v8::internal
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_