MIPS: Fix '[regexp] implement case-insensitive unicode regexps.'

src/regexp/mips64/regexp-macro-assembler-mips64.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_MIPS64
 
 #include "src/regexp/mips64/regexp-macro-assembler-mips64.h"
 
 #include "src/code-stubs.h"
 #include "src/log.h"
@@ skipping 344 matching lines @@
     // Save length in callee-save register for use on return.
     __ mov(s3, a1);
     // Address of current input position.
     __ Daddu(a1, current_input_offset(), Operand(end_of_input_address()));
     if (read_backward) {
       __ Dsubu(a1, a1, Operand(s3));
     }
     // Isolate.
 #ifdef V8_I18N_SUPPORT
     if (unicode) {
-      __ li(a3, Operand(zero_reg));
+      __ mov(a3, zero_reg);
     } else  // NOLINT
 #endif      // V8_I18N_SUPPORT
     {
       __ li(a3, Operand(ExternalReference::isolate_address(masm_->isolate())));
     }
 
     {
       AllowExternalCallThatCantCauseGC scope(masm_);
       ExternalReference function =
           ExternalReference::re_case_insensitive_compare_uc16(masm_->isolate());
@@ skipping 951 matching lines @@
 }
 
 #undef __
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS64