Cleanup V8_TURBOFAN_TARGET definition.

src/compiler/pipeline.h

Index: src/compiler/pipeline.h
diff --git a/src/compiler/pipeline.h b/src/compiler/pipeline.h
index 82af766c3c426414e857effc426d2a8a69237cf8..f6dd39a34b6eb6b59335f4a5747ee4506f0f2296 100644
--- a/src/compiler/pipeline.h
+++ b/src/compiler/pipeline.h
@@ -12,16 +12,6 @@
 // Note: TODO(turbofan) implies a performance improvement opportunity,
 //   and TODO(name) implies an incomplete implementation
 
-#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64 || V8_TARGET_ARCH_ARM
-#ifndef _WIN64
-#define V8_TURBOFAN_TARGET 1
-#else
-#define V8_TURBOFAN_TARGET 0
-#endif
-#else
-#define V8_TURBOFAN_TARGET 0
-#endif
-
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ -49,6 +39,7 @@ class Pipeline {
   Zone* zone() { return info_->zone(); }
   Isolate* isolate() { return info_->isolate(); }
 
+  static inline bool SupportedBackend() { return V8_TURBOFAN_BACKEND != 0; }
   static inline bool SupportedTarget() { return V8_TURBOFAN_TARGET != 0; }
 
   static inline bool VerifyGraphs() {