Remove CheckNotRegistersEqual regexp-masm function from all architectures.

src/mips/regexp-macro-assembler-mips.cc

 // Copyright 2012 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 426 matching lines @@
   }
   BranchOrBacktrack(on_no_match, ne, a3, Operand(t0));
   __ Branch(&loop, lt, a0, Operand(a1));
 
   // Move current character position to position after match.
   __ Subu(current_input_offset(), a2, end_of_input_address());
   __ bind(&fallthrough);
 }
 
 
-void RegExpMacroAssemblerMIPS::CheckNotRegistersEqual(int reg1,
-                                                      int reg2,
-                                                      Label* on_not_equal) {
-  UNIMPLEMENTED_MIPS();
-}
-
-
 void RegExpMacroAssemblerMIPS::CheckNotCharacter(uint32_t c,
                                                 Label* on_not_equal) {
   BranchOrBacktrack(on_not_equal, ne, current_character(), Operand(c));
 }
 
 
 void RegExpMacroAssemblerMIPS::CheckCharacterAfterAnd(uint32_t c,
                                                      uint32_t mask,
                                                      Label* on_equal) {
   __ And(a0, current_character(), Operand(mask));
@@ skipping 845 matching lines @@
 }
 
 
 #undef __
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }}  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS