Stage Intl.DateTimeFormat.formatToParts

Move it to HARMONY_STAGED bucket

Spec discussion:  https://github.com/tc39/ecma402/issues/30
It's in stage 4 and Firefox has already implemented it.

BUG=v8:5244
TEST=intl/date-format/date-format-to-parts.js
TEST=test262/intl402/DateTimeFormat/prototype/formatToParts/*

Review-Url: https://codereview.chromium.org/2317783003
Cr-Commit-Position: refs/heads/master@{#39258}

src/flag-definitions.h

@@ -191,7 +191,7 @@ DEFINE_IMPLICATION(es_staging, harmony_regexp_lookbehind)
 DEFINE_IMPLICATION(es_staging, move_object_start)
 
 // Features that are still work in progress (behind individual flags).
-#define HARMONY_INPROGRESS_BASE(V)                                      \
+#define HARMONY_INPROGRESS(V)                                           \
   V(harmony_array_prototype_values, "harmony Array.prototype.values")   \
   V(harmony_function_sent, "harmony function.sent")                     \
   V(harmony_sharedarraybuffer, "harmony sharedarraybuffer")             \
@@ -206,14 +206,6 @@ DEFINE_IMPLICATION(es_staging, move_object_start)
   V(harmony_trailing_commas,                                            \
     "harmony trailing commas in function parameter lists")
 
-#ifdef V8_I18N_SUPPORT
-#define HARMONY_INPROGRESS(V) \
-  HARMONY_INPROGRESS_BASE(V)  \
-  V(datetime_format_to_parts, "Intl.DateTimeFormat.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_BASE(V)                                               \
   V(harmony_regexp_lookbehind, "harmony regexp lookbehind")                  \
@@ -222,8 +214,9 @@ DEFINE_IMPLICATION(es_staging, move_object_start)
   V(harmony_string_padding, "harmony String-padding methods")
 
 #ifdef V8_I18N_SUPPORT
-#define HARMONY_STAGED(V) \
-  HARMONY_STAGED_BASE(V)  \
+#define HARMONY_STAGED(V)                                          \
+  HARMONY_STAGED_BASE(V)                                           \
+  V(datetime_format_to_parts, "Intl.DateTimeFormat.formatToParts") \
   V(icu_case_mapping, "case mapping with ICU rather than Unibrow")
 #else
 #define HARMONY_STAGED(V) HARMONY_STAGED_BASE(V)

test/test262/test262.status

@@ -459,7 +459,6 @@
   'language/expressions/arrow-function/params-dflt-duplicates': [FAIL],
 
   # https://bugs.chromium.org/p/v8/issues/detail?id=5244
-  'intl402/DateTimeFormat/prototype/formatToParts/*': [SKIP],
   'intl402/NumberFormat/prototype/formatToParts/*': [SKIP],
 
   # https://bugs.chromium.org/p/v8/issues/detail?id=5327