Reland "Ship BigInts"

This is a reland of 16aecc5d

Intent to ship:
https://groups.google.com/d/msg/v8-users/ShhW0Xewph0/1-OT9q0_DQAJ

Originally reviewed at:
Reviewed-on: https://chromium-review.googlesource.com/981596

Bug: v8:6791
Change-Id: I772af807b9486081d7cd96b538bf5bc98d4dcffe
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng;luci.v8.try:v8_linux_blink_rel
Reviewed-on: https://chromium-review.googlesource.com/984857Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52307}

src/flag-definitions.h

@@ -222,7 +222,6 @@ DEFINE_IMPLICATION(harmony_class_fields, harmony_private_fields)
     "constructor")                                                      \
   V(harmony_public_fields, "harmony public fields in class literals")   \
   V(harmony_private_fields, "harmony private fields in class literals") \
-  V(harmony_bigint, "harmony arbitrary precision integers")             \
   V(harmony_numeric_separator, "harmony numeric separator between digits")
 
 // Features that are shipping (turned on by default, but internal flag remains).
@@ -236,6 +235,7 @@ DEFINE_IMPLICATION(harmony_class_fields, harmony_private_fields)
   V(harmony_promise_finally, "harmony Promise.prototype.finally")             \
   V(harmony_optional_catch_binding, "allow omitting binding in catch blocks") \
   V(harmony_import_meta, "harmony import.meta property")                      \
+  V(harmony_bigint, "harmony arbitrary precision integers")                   \
   V(harmony_dynamic_import, "harmony dynamic import")
 
 #ifdef V8_INTL_SUPPORT

test/debugger/debug/side-effect/debug-evaluate-no-side-effect-builtins.js

@@ -99,8 +99,13 @@ function listener(event, exec_state, event_data, data) {
     success(undefined, `data_view.byteLength`);
     success(undefined, `data_view.byteOffset`);
     for (f of Object.getOwnPropertyNames(DataView.prototype)) {
-      if (typeof data_view[f] === 'function' && f.startsWith('get'))
-        success(0, `data_view.${f}()`);
+      if (typeof data_view[f] === 'function') {
+        if (f.startsWith('getBig')) {
+          success(0n, `data_view.${f}()`);
+        } else if (f.startsWith('get')) {
+          success(0, `data_view.${f}()`);
+        }
+      }
     }
 
     // Test TypedArray functions.

test/test262/test262.status

@@ -391,6 +391,19 @@
   'built-ins/TypedArray/prototype/set/typedarray-arg-set-values-same-buffer-same-type-sab': ['--harmony-sharedarraybuffer'],
   'built-ins/TypedArrays/internals/Get/indexed-value-sab': ['--harmony-sharedarraybuffer'],
 
+  # 64-bit Atomics are not implemented yet.
+  'built-ins/Atomics/wake/bad-range': ['--noharmony-bigint'],
+  'built-ins/Atomics/xor/bad-range': ['--noharmony-bigint'],
+  'built-ins/Atomics/load/bad-range': ['--noharmony-bigint'],
+  'built-ins/Atomics/compareExchange/bad-range': ['--noharmony-bigint'],
+  'built-ins/Atomics/wait/bad-range': ['--noharmony-bigint'],
+  'built-ins/Atomics/exchange/bad-range': ['--noharmony-bigint'],
+  'built-ins/Atomics/sub/bad-range': ['--noharmony-bigint'],
+  'built-ins/Atomics/store/bad-range': ['--noharmony-bigint'],
+  'built-ins/Atomics/or/bad-range': ['--noharmony-bigint'],
+  'built-ins/Atomics/and/bad-range': ['--noharmony-bigint'],
+  'built-ins/Atomics/add/bad-range': ['--noharmony-bigint'],
+
   # https://bugs.chromium.org/p/v8/issues/detail?id=6049
   'built-ins/Object/internals/DefineOwnProperty/consistent-value-function-caller': [FAIL_SLOPPY],
   'built-ins/Object/internals/DefineOwnProperty/consistent-value-function-arguments': [FAIL_SLOPPY],