Remove CheckNotRegistersEqual regexp-masm function from all architectures.

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

Index: src/arm/regexp-macro-assembler-arm.cc
diff --git a/src/arm/regexp-macro-assembler-arm.cc b/src/arm/regexp-macro-assembler-arm.cc
index a833624cebf1dd289ffcffb410ba7d3583d3c582..bc456d43e5cb0c55e5065a41c234db684583e8ad 100644
--- a/src/arm/regexp-macro-assembler-arm.cc
+++ b/src/arm/regexp-macro-assembler-arm.cc
@@ -432,16 +432,6 @@ void RegExpMacroAssemblerARM::CheckNotBackReference(
 }
 
 
-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));