This patch updates to the latest test262 version

A number of known failures are marked. To support test262's
new tests which simulate multiple script tags, this patch
calls out to the d8 realm API from the harness adaptation code.

Review-Url: https://codereview.chromium.org/2290023002
Cr-Commit-Position: refs/heads/master@{#39099}

DEPS

@@ -37,7 +37,7 @@ deps = {
     Var("git_url") + "/v8/deps/third_party/mozilla-tests.git" + "@" + "f6c578a10ea707b1a8ab0b88943fe5115ce2b9be",
   "v8/test/simdjs/data": Var("git_url") + "/external/github.com/tc39/ecmascript_simd.git" + "@" + "baf493985cb9ea7cdbd0d68704860a8156de9556",
   "v8/test/test262/data":
-    Var("git_url") + "/external/github.com/tc39/test262.git" + "@" + "88bc7fe7586f161201c5f14f55c9c489f82b1b67",
+    Var("git_url") + "/external/github.com/tc39/test262.git" + "@" + "29c23844494a7cc2fbebc6948d2cb0bcaddb24e7",
   "v8/test/test262/harness":
     Var("git_url") + "/external/github.com/test262-utils/test262-harness-py.git" + "@" + "cbd968f54f7a95c6556d53ba852292a4c49d11d8",
   "v8/tools/clang":

test/test262/detachArrayBuffer.js

@@ -5,3 +5,5 @@
 function $DETACHBUFFER(buffer) {
   %ArrayBufferNeuter(buffer);
 }
+
+$.detachArrayBuffer = $DETACHBUFFER;

test/test262/harness-adapt.js

@@ -89,3 +89,7 @@ function $DONE(arg){
 
     quit(0);
 };
+
+var $ = {
+  evalScript(script) { return Realm.eval(Realm.current(), script); }
+};