[Bug sanitizer/69840] two ASAN help nits

[marxin at gcc dot gnu.org]

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

--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #4)
> Then we have to agree that this code breaks GNU output style.  Or it breaks
> LLVM output style.  It is one or the other, I rather see a way to do this
> dynamically of breaking up the lines (this was done in the past for GCC's
> diagnostic so it definitely can be done).

I like your idea, thus I've created a new version of pull request that directs
the dump output format by a compiler macro (_GNU_HELP_OUTPUT).

Enabling the macro in Makefile.{am,in} would be the only necessary change in
GCC.
Let's see what the LLVM folks will say about the change.