[regexp] implement /ui to mirror the implementation for /i.

test/cctest/test-strings.cc

Index: test/cctest/test-strings.cc
diff --git a/test/cctest/test-strings.cc b/test/cctest/test-strings.cc
index e992f33c8bc8aaf91e4951398ff1e70e6851ba0d..6c765a73aae77d7ca6de900d93cf56edefa54c4e 100644
--- a/test/cctest/test-strings.cc
+++ b/test/cctest/test-strings.cc
@@ -1382,7 +1382,7 @@ TEST(IsAscii) {
 
 template<typename Op, bool return_first>
 static uint16_t ConvertLatin1(uint16_t c) {
-  uint32_t result[Op::kMaxWidth];
+  uc32 result[Op::kMaxWidth];
   int chars;
   chars = Op::Convert(c, 0, result, NULL);
   if (chars == 0) return 0;