Remove CheckNotRegistersEqual regexp-masm function from all architectures.

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

 // Copyright 2009 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 414 matching lines @@
   BranchOrBacktrack(ne, on_no_match);
   __ cmp(r0, r1);
   __ b(lt, &loop);
 
   // Move current character position to position after match.
   __ sub(current_input_offset(), r2, end_of_input_address());
   __ bind(&fallthrough);
 }
 
 
-void RegExpMacroAssemblerARM::CheckNotRegistersEqual(int reg1,
-                                                     int reg2,
-                                                     Label* on_not_equal) {
-  __ ldr(r0, register_location(reg1));
-  __ ldr(r1, register_location(reg2));
-  __ cmp(r0, r1);
-  BranchOrBacktrack(ne, on_not_equal);
-}
-
-
 void RegExpMacroAssemblerARM::CheckNotCharacter(unsigned c,
                                                 Label* on_not_equal) {
   __ cmp(current_character(), Operand(c));
   BranchOrBacktrack(ne, on_not_equal);
 }
 
 
 void RegExpMacroAssemblerARM::CheckCharacterAfterAnd(uint32_t c,
                                                      uint32_t mask,
                                                      Label* on_equal) {
@@ skipping 895 matching lines @@
   __ ldr(pc, MemOperand(sp, stack_alignment, PostIndex));
 }
 
 #undef __
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }}  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM