[Intl] Ship Intl.Segmenter

Spec: https://tc39.es/proposal-intl-segmenter/
ECMA402 site: https://github.com/tc39/proposal-intl-segmenter
I2S: https://groups.google.com/a/chromium.org/g/blink-dev/c/MJ1OpvkcA8s/m/mYNxpwqSCAAJ
I2I: https://groups.google.com/a/chromium.org/g/blink-dev/c/muRQBwyzzPw/m/rB_2I9t0CQAJ
Design Doc: https://docs.google.com/document/d/1xugLpLmgRFnNXK8ztariTAbD2IXueDw1T3VNuuZCz8k/edit
CPS: https://www.chromestatus.com/feature/6099397733515264
Test262 Tests: https://github.com/tc39/test262/tree/main/test/intl402/Segmenter
v8 tests: https://source.chromium.org/chromium/chromium/src/+/master:v8/test/intl/segmenter/?q=test%2Fintl%2Fsegmenter&ss=chromium

Approved by API Owners: yoav@yoav.ws / chrishtr@chromium.org / bratell.d@gmail.com

Bug: v8:6891
Change-Id: I64775ed63557a9e1af77560abd42349742bc4c03
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2376967Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69593}

src/flags/flag-definitions.h

@@ -242,8 +242,7 @@ DEFINE_IMPLICATION(harmony_weak_refs_with_cleanup_some, harmony_weak_refs)
 #define HARMONY_STAGED(V)               \
   HARMONY_STAGED_BASE(V)                \
   V(harmony_intl_dateformat_day_period, \
-    "Add dayPeriod option to DateTimeFormat")              \
-  V(harmony_intl_segmenter, "Intl.Segmenter")
+    "Add dayPeriod option to DateTimeFormat")
 #else
 #define HARMONY_STAGED(V) HARMONY_STAGED_BASE(V)
 #endif
@@ -262,7 +261,13 @@ DEFINE_IMPLICATION(harmony_weak_refs_with_cleanup_some, harmony_weak_refs)
   V(harmony_string_replaceall, "harmony String.prototype.replaceAll")     \
   V(harmony_logical_assignment, "harmony logical assignment")
 
+#ifdef V8_INTL_SUPPORT
+#define HARMONY_SHIPPING(V) \
+  HARMONY_SHIPPING_BASE(V)  \
+  V(harmony_intl_segmenter, "Intl.Segmenter")
+#else
 #define HARMONY_SHIPPING(V) HARMONY_SHIPPING_BASE(V)
+#endif
 
 // Once a shipping feature has proved stable in the wild, it will be dropped
 // from HARMONY_SHIPPING, all occurrences of the FLAG_ variable are removed,