Add C standard upgrade in clang-11 release note

[nickdesaulniers]

Summary

As per rsmith (https://reviews.llvm.org/D75383).

[hans]

lgtm with comment

clang/docs/ReleaseNotes.rst

551

I would s/following/next/ just to be extra clear.

[nickdesaulniers]

• s/following/next/

[nickdesaulniers]

pushed: https://github.com/llvm/llvm-project/commit/001c8aac80e3924c33a4cc644cca58401c72fe6b

[nickdesaulniers]

Abandoning; I've already pushed this to the right branch. I suspect phabricator doesn't watch the release brances.

clang/docs/ReleaseNotes.rst

char *getelementpointer_safe(char *base, unsigned long offset) {
       // ``nullptr``, we must use ``computed`` result.
       if (((base == nullptr) && (computed != nullptr)) ||
           ((base != nullptr) && (computed == nullptr)))
         return computed;
       // Else we can use ``getelementpointer_inbounds()``.
       return getelementpointer_inbounds(base, offset);
     }
 
+Changes deferred to Clang-11 release
+------------------------------------
+
+- The next release of clang (clang-11) will upgrade the default C language
+  standard used if not specified via command line from gnu11 to gnu17.
+
 
 Additional Information
 ======================
 
 A wide variety of additional information is available on the `Clang web
 page <https://clang.llvm.org/>`_. The web page contains versions of the
 API documentation which are up-to-date with the Subversion version of
 the source code. You can access versions of these documents specific to
 this release by going into the "``clang/docs/``" directory in the Clang
 tree.
 
 If you have any questions or comments about Clang, please feel free to
 contact us via the `mailing
 list <https://lists.llvm.org/mailman/listinfo/cfe-dev>`_.