[ic] Remove unnecessary access rights checks from the IC handlers.

src/ppc/macro-assembler-ppc.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PPC_MACRO_ASSEMBLER_PPC_H_
 #define V8_PPC_MACRO_ASSEMBLER_PPC_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
@@ skipping 644 matching lines @@
   // Push a new stack handler and link into stack handler chain.
   void PushStackHandler();
 
   // Unlink the stack handler on top of the stack from the stack handler chain.
   // Must preserve the result register.
   void PopStackHandler();
 
   // ---------------------------------------------------------------------------
   // Inline caching support
 
-  // Generate code for checking access rights - used for security checks
-  // on access to global objects across environments. The holder register
-  // is left untouched, whereas both scratch registers are clobbered.
-  void CheckAccessGlobalProxy(Register holder_reg, Register scratch,
-                              Label* miss);
-
   void GetNumberHash(Register t0, Register scratch);
 
   inline void MarkCode(NopMarkerTypes type) { nop(type); }
 
   // Check if the given instruction is a 'type' marker.
   // i.e. check if is is a mov r<type>, r<type> (referenced as nop(type))
   // These instructions are generated to mark special location in the code,
   // like some special IC code.
   static inline bool IsMarkedCode(Instr instr, int type) {
     DCHECK((FIRST_IC_MARKER <= type) && (type < LAST_CODE_MARKER));
@@ skipping 972 matching lines @@
 inline MemOperand NativeContextMemOperand() {
   return ContextMemOperand(cp, Context::NATIVE_CONTEXT_INDEX);
 }
 
 #define ACCESS_MASM(masm) masm->
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PPC_MACRO_ASSEMBLER_PPC_H_