[Bug sanitizer/69840] two ASAN help nits

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69840

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 37741
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37741&action=edit
Patch draft

I've tried to sketch-up a simple patch that can do that.
As the original source of the modified code is in LLVM project (which is merged
to GCC), please create a PR in LLVM and I'll try to apply to patch to current
LLVM trunk. The patch can be send eventually.

Martin