[promise] Ship Promise.allSettled

Bug: v8:9060
Change-Id: I37282dd362cfdd0a162a76b122870f643ef5c8eb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1582483
Commit-Queue: Adam Klein <adamk@chromium.org>
Auto-Submit: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61024}

src/flag-definitions.h

@@ -228,8 +228,7 @@ DEFINE_IMPLICATION(harmony_private_methods, harmony_private_fields)
 #endif
 
 // Features that are complete (but still behind --harmony/es-staging flag).
-#define HARMONY_STAGED_BASE(V) \
-  V(harmony_promise_all_settled, "harmony Promise.allSettled")
+#define HARMONY_STAGED_BASE(V)
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_STAGED(V)                                                  \
@@ -253,7 +252,8 @@ DEFINE_IMPLICATION(harmony_private_methods, harmony_private_fields)
   V(harmony_await_optimization, "harmony await taking 1 tick")                 \
   V(harmony_private_fields, "harmony private fields in class literals")        \
   V(harmony_hashbang, "harmony hashbang syntax")                               \
-  V(harmony_numeric_separator, "harmony numeric separator between digits")
+  V(harmony_numeric_separator, "harmony numeric separator between digits")     \
+  V(harmony_promise_all_settled, "harmony Promise.allSettled")
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_SHIPPING(V)                                                \