X87: [regexp] correctly advance zero length matches for global/unicode.

src/regexp/x87/regexp-macro-assembler-x87.cc

Index: src/regexp/x87/regexp-macro-assembler-x87.cc
diff --git a/src/regexp/x87/regexp-macro-assembler-x87.cc b/src/regexp/x87/regexp-macro-assembler-x87.cc
index 01d0b249b6fe15b9f0d56e65742d6b0d6910c5f9..c1aa54f8f42de21cd4dfa6d97710365f79e90355 100644
--- a/src/regexp/x87/regexp-macro-assembler-x87.cc
+++ b/src/regexp/x87/regexp-macro-assembler-x87.cc
@@ -187,7 +187,6 @@ void RegExpMacroAssemblerX87::CheckGreedyLoop(Label* on_equal) {
   __ bind(&fallthrough);
 }
 
-
 void RegExpMacroAssemblerX87::CheckNotBackReferenceIgnoreCase(
     int start_reg, bool read_backward, Label* on_no_match) {
   Label fallthrough;
@@ -822,13 +821,15 @@ Handle<HeapObject> RegExpMacroAssemblerX87::GetCode(Handle<String> source) {
         __ test(edi, edi);
         __ j(zero, &exit_label_, Label::kNear);
         // Advance current position after a zero-length match.
+        Label advance;
+        __ bind(&advance);
         if (mode_ == UC16) {
           __ add(edi, Immediate(2));
         } else {
           __ inc(edi);
         }
+        if (global_unicode()) CheckNotInSurrogatePair(0, &advance);
       }
-
       __ jmp(&load_char_start_regexp);
     } else {
       __ mov(eax, Immediate(SUCCESS));