deps: cherry-pick f5fad6d from upstream v8

Original commit message:

    This commit adds a getter for the private is_verbose_ member.
    The use case for this comes from Node.js where the ability to avoid
    calling FatalException if the TryCatch is verbose would be nice
    to have.

    BUG=

    Review-Url: https://codereview.chromium.org/2840803002
    Cr-Commit-Position: refs/heads/master@{#45018}

PR-URL: #12826
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

Author: danbev

deps/v8/include/v8.h

@@ -8168,6 +8168,11 @@ class V8_EXPORT TryCatch {
    */
   void SetVerbose(bool value);
 
+  /**
+   * Returns true if verbosity is enabled.
+   */
+  bool IsVerbose() const;
+
   /**
    * Set whether or not this TryCatch should capture a Message object
    * which holds source information about where the exception

deps/v8/src/api.cc

@@ -2709,6 +2709,10 @@ void v8::TryCatch::SetVerbose(bool value) {
   is_verbose_ = value;
 }
 
+bool v8::TryCatch::IsVerbose() const {
+  return is_verbose_;
+}
+
 
 void v8::TryCatch::SetCaptureMessage(bool value) {
   capture_message_ = value;