deps: cherry-pick 09b53ee from upstream V8

Original commit message:

    [api] Make running scripts in AddMessageListener callback work in debug mode

    The existance of an `AllowJavascriptExecutionDebugOnly` scope in
    `Isolate::ReportPendingMessages()` indicates that the API supports
    running arbitrary JS code in a `AddMessageListener` callback.

    Currently, this can fail in debug mode: The
    `!isolate->external_caught_exception()` condition is checked when
    entering API methods inside such a handler. However, if there is
    a verbose `TryCatch` active when the exception occurs, this
    check fails, and when calling `ToString()` on the exception object
    leaves a pending exception itself, the flag is re-set to `true`.

    Fix this problem by clearing the flag and the pending exception if
    there was one during `ToString()`. This matches the code a few lines
    up in `messages.cc`, so the exception state is now consistent
    during the callback.

    This currently makes a Node.js test fail in debug mode
    (`parallel/test-error-reporting`).

    Bug: node:7144
    Bug: node:17016
    Change-Id: I060d00fea3e9a497f4df34c6ff8d6e29ebe96321
    Reviewed-on: https://chromium-review.googlesource.com/718096
    Commit-Queue: Yang Guo <yangguo@chromium.org>
    Reviewed-by: Yang Guo <yangguo@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#49466}

Refs: v8/v8@09b53ee

PR-URL: #21767
Refs: v8/v8@09b53ee
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Myles Borins <myles.borins@gmail.com>

Author: addaleax

deps/v8/AUTHORS

@@ -42,7 +42,7 @@ Alexis Campailla <alexis@janeasystems.com>
 Andreas Anyuru <andreas.anyuru@gmail.com>
 Andrew Paprocki <andrew@ishiboo.com>
 Andrei Kashcha <anvaka@gmail.com>
-Anna Henningsen <addaleax@gmail.com>
+Anna Henningsen <anna@addaleax.net>
 Bangfu Tao <bangfu.tao@samsung.com>
 Ben Noordhuis <info@bnoordhuis.nl>
 Benjamin Tan <demoneaux@gmail.com>

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 6
 #define V8_MINOR_VERSION 2
 #define V8_BUILD_NUMBER 414
-#define V8_PATCH_LEVEL 61
+#define V8_PATCH_LEVEL 62
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/src/messages.cc

@@ -114,6 +114,9 @@ void MessageHandler::ReportMessage(Isolate* isolate, const MessageLocation* loc,
       }
 
       if (!maybe_stringified.ToHandle(&stringified)) {
+        DCHECK(isolate->has_pending_exception());
+        isolate->clear_pending_exception();
+        isolate->set_external_caught_exception(false);
         stringified =
             isolate->factory()->NewStringFromAsciiChecked("exception");
       }

deps/v8/test/cctest/test-api.cc

@@ -5747,23 +5747,55 @@ TEST(CustomErrorMessage) {
 
 static void check_custom_rethrowing_message(v8::Local<v8::Message> message,
                                             v8::Local<v8::Value> data) {
+  CHECK(data->IsExternal());
+  int* callcount = static_cast<int*>(data.As<v8::External>()->Value());
+  ++*callcount;
+
   const char* uncaught_error = "Uncaught exception";
   CHECK(message->Get()
             ->Equals(CcTest::isolate()->GetCurrentContext(),
                      v8_str(uncaught_error))
             .FromJust());
+  // Test that compiling code inside a message handler works.
+  CHECK(CompileRunChecked(CcTest::isolate(), "(function(a) { return a; })(42)")
+            ->Equals(CcTest::isolate()->GetCurrentContext(),
+                     v8::Integer::NewFromUnsigned(CcTest::isolate(), 42))
+            .FromJust());
 }
 
 
 TEST(CustomErrorRethrowsOnToString) {
+  int callcount = 0;
   LocalContext context;
-  v8::HandleScope scope(context->GetIsolate());
-  context->GetIsolate()->AddMessageListener(check_custom_rethrowing_message);
+  v8::Isolate* isolate = context->GetIsolate();
+  v8::HandleScope scope(isolate);
+  context->GetIsolate()->AddMessageListener(
+      check_custom_rethrowing_message, v8::External::New(isolate, &callcount));
+
+  CompileRun(
+      "var e = { toString: function() { throw e; } };"
+      "try { throw e; } finally {}");
+
+  CHECK_EQ(callcount, 1);
+  context->GetIsolate()->RemoveMessageListeners(
+      check_custom_rethrowing_message);
+}
+
+TEST(CustomErrorRethrowsOnToStringInsideVerboseTryCatch) {
+  int callcount = 0;
+  LocalContext context;
+  v8::Isolate* isolate = context->GetIsolate();
+  v8::HandleScope scope(isolate);
+  v8::TryCatch try_catch(isolate);
+  try_catch.SetVerbose(true);
+  context->GetIsolate()->AddMessageListener(
+      check_custom_rethrowing_message, v8::External::New(isolate, &callcount));
 
   CompileRun(
       "var e = { toString: function() { throw e; } };"
       "try { throw e; } finally {}");
 
+  CHECK_EQ(callcount, 1);
   context->GetIsolate()->RemoveMessageListeners(
       check_custom_rethrowing_message);
 }