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

src/regexp/arm64/regexp-macro-assembler-arm64.cc

Index: src/regexp/arm64/regexp-macro-assembler-arm64.cc
diff --git a/src/regexp/arm64/regexp-macro-assembler-arm64.cc b/src/regexp/arm64/regexp-macro-assembler-arm64.cc
index 9948597ca0e4b72ee064ab700d838afd05c960f6..c3e366f3a332d552b256ae3f5ac9b4f1946525a4 100644
--- a/src/regexp/arm64/regexp-macro-assembler-arm64.cc
+++ b/src/regexp/arm64/regexp-macro-assembler-arm64.cc
@@ -991,9 +991,12 @@ Handle<HeapObject> RegExpMacroAssemblerARM64::GetCode(Handle<String> source) {
         // Offset from the end is zero if we already reached the end.
         __ Cbz(current_input_offset(), &return_w0);
         // Advance current position after a zero-length match.
+        Label advance;
+        __ bind(&advance);
         __ Add(current_input_offset(),
                current_input_offset(),
                Operand((mode_ == UC16) ? 2 : 1));
+        if (global_unicode()) CheckNotInSurrogatePair(0, &advance);
       }
 
       __ B(&load_char_start_regexp);