VM initialization refactoring.

src/cpu.h

Index: src/cpu.h
diff --git a/src/cpu.h b/src/cpu.h
index ddc402f7de090d8b11f9ba838e1adc3acaca45b0..e3073027c1a7559d9a4bbda6d082e69e2783b911 100644
--- a/src/cpu.h
+++ b/src/cpu.h
@@ -53,6 +53,8 @@ class CPU : public AllStatic {
   // Initializes the cpu architecture support. Called once at VM startup.
   static void Setup();
 
+  static bool SupportsCrankshaft();
+
   // Flush instruction cache.
   static void FlushICache(void* start, size_t size);