[Bug middle-end/116235] New: Add ASAN annotations to ggc like we do for Valgrind

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116235

            Bug ID: 116235
           Summary: Add ASAN annotations to ggc like we do for Valgrind
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: GC, internal-improvement
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sjames at gcc dot gnu.org
  Target Milestone: ---

ASAN supports marking memory as undefined ("poisoned") just like
--enable-valgrind-annotations does right now.

We should do that for some better coverage given running Valgrind at scale is
too slow and also doesn't work on all arches or even microarches.