Get rid of JSExitStub which is no longer used anywhere.

src/code-stubs.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 38 matching lines @@
     ToBoolean,
     Instanceof,
     CounterOp,
     ArgumentsAccess,
     Runtime,
     CEntry,
     JSEntry,
     GetProperty,   // ARM only
     SetProperty,   // ARM only
     InvokeBuiltin,  // ARM only
-    JSExit,        // ARM only
     RegExpCEntry,  // ARM only
     NUMBER_OF_IDS
   };
 
   // Retrieve the code for the stub. Generate the code if needed.
   Handle<Code> GetCode();
 
   static Major MajorKeyFromKey(uint32_t key) {
     return static_cast<Major>(MajorKeyBits::decode(key));
   };
@@ skipping 38 matching lines @@
 
   class MajorKeyBits: public BitField<uint32_t, 0, kMajorBits> {};
   class MinorKeyBits: public BitField<uint32_t, kMajorBits, kMinorBits> {};
 
   friend class BreakPointIterator;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_