Decouple CpuFeatures from serializer state.

src/arm64/assembler-arm64.h

Index: src/arm64/assembler-arm64.h
diff --git a/src/arm64/assembler-arm64.h b/src/arm64/assembler-arm64.h
index 5a28ea6c9e4eff5f11c908ad09361b4a0839b6c9..0f407ce2464c3cb5f3f7cd7fc8a85e318bb3f109 100644
--- a/src/arm64/assembler-arm64.h
+++ b/src/arm64/assembler-arm64.h
@@ -8,12 +8,12 @@
 #include <list>
 #include <map>
 
+#include "cpu.h"
 #include "globals.h"
 #include "utils.h"
 #include "assembler.h"
 #include "serialize.h"
 #include "arm64/instructions-arm64.h"
-#include "arm64/cpu-arm64.h"
 
 
 namespace v8 {
@@ -655,7 +655,7 @@ class Operand {
   // Relocation information.
   RelocInfo::Mode rmode() const { return rmode_; }
   void set_rmode(RelocInfo::Mode rmode) { rmode_ = rmode; }
-  bool NeedsRelocation(Isolate* isolate) const;
+  bool NeedsRelocation(const Assembler* assembler) const;
 
   // Helpers
   inline static Operand UntagSmi(Register smi);