[Bug debug/68771] Darwin: PGO + LTO + multiple threads creates corrupted profile info.

[zerolo at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68771

--- Comment #24 from Daniel Vollmer <zerolo at gmail dot com> ---
(In reply to Iain Sandoe from comment #23)

> My freshly-built 7.4 (bootstrapped with 10.1 xc effectively) doesn't
> reproduce it, neither do any other branches I have lying around - so we're
> not there yet.
> 
> I take it that the full code does fail with 8.3?

The full example fails with both the homebrew built 8.3, but also the freshly
compiled (on 10.14.4) 7.4.0, so I guess my smaller example is not (as)
representative as I'd hoped.