[PATCH 0/13] v2 warning control by group and location (PR 74765)

[Martin Sebor via Gcc-patches]

This is a revised patch series to add warning control by group and
location, updated based on feedback on the initial series.

v2 changes include:

1) Use opt_code rather than int for the option argument to the new
   APIs.  This let me find and fix a bug in the original Ada change.
2) Use suppress_warning() and warning_suppressed_p() instead of
   get/set_no_warning, and also instead of warning_enabled/disabled
   for the names of the new functions (as requested/clarified offline
   by David).
3) Make the removal of the TREE_NO_WARNING macro and
   the gimple_get_no_warning_p() and gimple_set_no_warning()
   functions a standalone patch.
4) Include tests for PR 74765 and 74762 fixed by these changes.

I have retested the whole patch series on x86_64-linux.