[regexp] Support Regional_Indicator property class

This patch adds support for Regional_Indicator within Unicode property
escapes in regular expressions.

The Regional_Indicator binary property was added in Unicode v10 and is
supported in ICU 60.1.

An `#if` directive is used to prevent breaking Node.js until they
update their ICU.

BUG=v8:4743

Cq-Include-Trybots: master.tryserver.v8:v8_linux_noi18n_rel_ng
Change-Id: I7acec13c8ae7552558a0f852937984bba828e738
Reviewed-on: https://chromium-review.googlesource.com/758273Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49250}

src/regexp/regexp-parser.cc

@@ -1249,6 +1249,9 @@ bool IsSupportedBinaryProperty(UProperty property) {
     case UCHAR_PATTERN_WHITE_SPACE:
     case UCHAR_QUOTATION_MARK:
     case UCHAR_RADICAL:
+#if U_ICU_VERSION_MAJOR_NUM >= 60
+    case UCHAR_REGIONAL_INDICATOR:
+#endif
     case UCHAR_S_TERM:
     case UCHAR_SOFT_DOTTED:
     case UCHAR_TERMINAL_PUNCTUATION:

test/mjsunit/harmony/regexp-property-binary.js

@@ -137,6 +137,9 @@ f(/\p{QMark}/u, "A");
 t(/\p{Radical}/u, "\u2FAD");
 f(/\p{Radical}/u, "A");
 
+t(/\p{Regional_Indicator}/u, "\u{1F1E6}");
+f(/\p{Regional_Indicator}/u, "A");
+
 t(/\p{Sentence_Terminal}/u, "!");
 f(/\p{STerm}/u, "A");
 

test/test262/test262.status

@@ -449,9 +449,6 @@
   'built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Katakana': [SKIP],
   'built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Yi': [SKIP],
 
-  # TODO(mathias): Add support for Regional_Indicator now that ICU 60.1 has it.
-  'built-ins/RegExp/property-escapes/generated/Regional_Indicator': [SKIP],
-
   # https://bugs.chromium.org/p/v8/issues/detail?id=6776
   'built-ins/Proxy/ownKeys/return-duplicate-entries-throws': [FAIL],
   'built-ins/Proxy/ownKeys/return-duplicate-symbol-entries-throws': [FAIL],