[intl] Stage --harmony-plural-rules

R=littledan@chromium.org, adamk@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel
CQ_INCLUDE_TRYBOTS=master.tryserver.v8:v8_linux_noi18n_rel_ng

Bug: v8:5601
Change-Id: Ie3edaa82957028100249b2d543e761233cd0d074
Reviewed-on: https://chromium-review.googlesource.com/661065Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Josh Wolfe <jwolfe@igalia.com>
Cr-Commit-Position: refs/heads/master@{#47961}

src/flag-definitions.h

@@ -200,14 +200,14 @@ DEFINE_IMPLICATION(es_staging, harmony)
 #define HARMONY_INPROGRESS(V)       \
   HARMONY_INPROGRESS_BASE(V)        \
   V(harmony_number_format_to_parts, \
-    "Intl.NumberFormat.prototype.formatToParts") \
-  V(harmony_plural_rules, "Intl.PluralRules")
+    "Intl.NumberFormat.prototype."  \
+    "formatToParts")
 #else
 #define HARMONY_INPROGRESS(V) HARMONY_INPROGRESS_BASE(V)
 #endif
 
 // Features that are complete (but still behind --harmony/es-staging flag).
-#define HARMONY_STAGED(V)                                               \
+#define HARMONY_STAGED_BASE(V)                                          \
   V(harmony_function_tostring, "harmony Function.prototype.toString")   \
   V(harmony_regexp_named_captures, "harmony regexp named captures")     \
   V(harmony_regexp_property, "harmony Unicode regexp property classes") \
@@ -218,6 +218,14 @@ DEFINE_IMPLICATION(es_staging, harmony)
   V(harmony_async_iteration, "harmony async iteration")                 \
   V(harmony_promise_finally, "harmony Promise.prototype.finally")
 
+#ifdef V8_INTL_SUPPORT
+#define HARMONY_STAGED(V) \
+  HARMONY_STAGED_BASE(V)  \
+  V(harmony_plural_rules, "Intl.PluralRules")
+#else
+#define HARMONY_STAGED(V) HARMONY_STAGED_BASE(V)
+#endif
+
 // Features that are shipping (turned on by default, but internal flag remains).
 #define HARMONY_SHIPPING(V)                                              \
   V(harmony_strict_legacy_accessor_builtins,                             \