[turbofan] Drop V8_TURBOFAN_BACKEND and V8_TURBOFAN_TARGET defines.

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 41c33fa7ab1e301f16f902e023ddf778dcd9f762..41edb30835dcf72e81a5a4a7b45c8a1ae00c3ac5 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -30,29 +30,6 @@
 # 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 {