[regexp] correctly advance zero length matches for global/unicode.

src/regexp/mips/regexp-macro-assembler-mips.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_MIPS
 
 #include "src/regexp/mips/regexp-macro-assembler-mips.h"
 
 #include "src/code-stubs.h"
 #include "src/log.h"
@@ skipping 790 matching lines @@
         if (global_with_zero_length_check()) {
           // Special case for zero-length matches.
           // t7: capture start index
           // Not a zero-length match, restart.
           __ Branch(
               &load_char_start_regexp, ne, current_input_offset(), Operand(t7));
           // Offset from the end is zero if we already reached the end.
           __ Branch(&exit_label_, eq, current_input_offset(),
                     Operand(zero_reg));
           // Advance current position after a zero-length match.
+          Label advance;
+          __ bind(&advance);
           __ Addu(current_input_offset(),
                   current_input_offset(),
                   Operand((mode_ == UC16) ? 2 : 1));
+          if (global_unicode()) CheckNotInSurrogatePair(0, &advance);
         }
 
         __ Branch(&load_char_start_regexp);
       } else {
         __ li(v0, Operand(SUCCESS));
       }
     }
     // Exit and return v0.
     __ bind(&exit_label_);
     if (global()) {
@@ skipping 464 matching lines @@
 
 
 #undef __
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS