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

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 442420e0df5baf04d26bb39f1866209767349402..f085509914b796e1ff6ad93be52c7fefce800c16 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -1289,14 +1289,6 @@ class MacroAssembler: public Assembler {
   // ---------------------------------------------------------------------------
   // 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, but the scratch register and kScratchRegister,
-  // which must be different, are clobbered.
-  void CheckAccessGlobalProxy(Register holder_reg,
-                              Register scratch,
-                              Label* miss);
-
   void GetNumberHash(Register r0, Register scratch);
 
   // ---------------------------------------------------------------------------