[esnext] ship "hashbang" syntax

Turns --harmony-hashbang on by default.

Intent to ship: https://groups.google.com/d/msg/v8-dev/hlCVa_XZ3TM/UWjjyOq3FwAJ
ChromeStatus page: https://www.chromestatus.com/feature/5134505706782720

BUG=v8:8523
R=gsathya@chromium.org, mathias@chromium.org, adamk@chromium.org

Change-Id: I821f69e45eb0a63a3f49181e2b88b0bcd091af2c
Reviewed-on: https://chromium-review.googlesource.com/c/1486113Reviewed-by: Adam Klein <adamk@chromium.org>
Reviewed-by: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Caitlin Potter <caitp@igalia.com>
Cr-Commit-Position: refs/heads/master@{#59847}

src/flag-definitions.h

@@ -213,9 +213,8 @@ 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_numeric_separator, "harmony numeric separator between digits") \
-  V(harmony_hashbang, "harmony hashbang syntax")
+#define HARMONY_STAGED_BASE(V) \
+  V(harmony_numeric_separator, "harmony numeric separator between digits")
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_STAGED(V)          \
@@ -239,7 +238,8 @@ DEFINE_IMPLICATION(harmony_private_methods, harmony_private_fields)
   V(harmony_string_matchall, "harmony String.prototype.matchAll")              \
   V(harmony_object_from_entries, "harmony Object.fromEntries()")               \
   V(harmony_await_optimization, "harmony await taking 1 tick")                 \
-  V(harmony_private_fields, "harmony private fields in class literals")
+  V(harmony_private_fields, "harmony private fields in class literals")        \
+  V(harmony_hashbang, "harmony hashbang syntax")
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_SHIPPING(V) \

test/test262/test262.status

@@ -555,29 +555,29 @@
   'language/expressions/prefix-increment/eval-nostrict': [SKIP],
 
   # https://bugs.chromium.org/p/v8/issues/detail?id=8850
-  'language/comments/hashbang/escaped-bang-041': [FAIL],
-  'language/comments/hashbang/escaped-bang-u0021': [FAIL],
-  'language/comments/hashbang/escaped-bang-u21': [FAIL],
-  'language/comments/hashbang/escaped-bang-x21': [FAIL],
-  'language/comments/hashbang/escaped-hash-043': [FAIL],
-  'language/comments/hashbang/escaped-hash-u0023': [FAIL],
-  'language/comments/hashbang/escaped-hash-u23': [FAIL],
-  'language/comments/hashbang/escaped-hash-x23': [FAIL],
-  'language/comments/hashbang/escaped-hashbang': [FAIL],
-  'language/comments/hashbang/eval': [FAIL],
-  'language/comments/hashbang/eval-indirect': [FAIL],
-  'language/comments/hashbang/module': [FAIL],
-  'language/comments/hashbang/multi-line-comment': [FAIL],
-  'language/comments/hashbang/no-line-separator': [FAIL],
-  'language/comments/hashbang/not-empty': [FAIL],
-  'language/comments/hashbang/preceding-directive-prologue': [FAIL],
-  'language/comments/hashbang/preceding-directive-prologue-sc': [FAIL],
-  'language/comments/hashbang/preceding-empty-statement': [FAIL],
-  'language/comments/hashbang/preceding-hashbang': [FAIL],
-  'language/comments/hashbang/preceding-line-comment': [FAIL],
-  'language/comments/hashbang/preceding-multi-line-comment': [FAIL],
-  'language/comments/hashbang/preceding-whitespace': [FAIL],
-  'language/comments/hashbang/use-strict': [FAIL],
+  'language/comments/hashbang/escaped-bang-041': [SKIP],
+  'language/comments/hashbang/escaped-bang-u0021': [SKIP],
+  'language/comments/hashbang/escaped-bang-u21': [SKIP],
+  'language/comments/hashbang/escaped-bang-x21': [SKIP],
+  'language/comments/hashbang/escaped-hash-043': [SKIP],
+  'language/comments/hashbang/escaped-hash-u0023': [SKIP],
+  'language/comments/hashbang/escaped-hash-u23': [SKIP],
+  'language/comments/hashbang/escaped-hash-x23': [SKIP],
+  'language/comments/hashbang/escaped-hashbang': [SKIP],
+  'language/comments/hashbang/eval': [SKIP],
+  'language/comments/hashbang/eval-indirect': [SKIP],
+  'language/comments/hashbang/module': [SKIP],
+  'language/comments/hashbang/multi-line-comment': [SKIP],
+  'language/comments/hashbang/no-line-separator': [SKIP],
+  'language/comments/hashbang/not-empty': [SKIP],
+  'language/comments/hashbang/preceding-directive-prologue': [SKIP],
+  'language/comments/hashbang/preceding-directive-prologue-sc': [SKIP],
+  'language/comments/hashbang/preceding-empty-statement': [SKIP],
+  'language/comments/hashbang/preceding-hashbang': [SKIP],
+  'language/comments/hashbang/preceding-line-comment': [SKIP],
+  'language/comments/hashbang/preceding-multi-line-comment': [SKIP],
+  'language/comments/hashbang/preceding-whitespace': [SKIP],
+  'language/comments/hashbang/use-strict': [SKIP],
 
   ######################## NEEDS INVESTIGATION ###########################