enable pgo on mercury macos

[k2662]

No description provided.

[Alex313031]

@k2662 PGO is a shitshow in Firefox. And they don't offer pre-made PGO profiles like Chromium, so you have to build it twice for each build.

I encounter many bugs with PGO. Sometimes I can fix it, othertimes It gets too frustrating and I don't wanna take the time, so I just disable it on a per-platform/per-build basis if it fails.

[k2662]

@k2662 PGO is a shitshow in Firefox. And they don't offer pre-made PGO profiles like Chromium, so you have to build it twice for each build.

I encounter many bugs with PGO. Sometimes I can fix it, othertimes It gets too frustrating and I don't wanna take the time, so I just disable it on a per-platform/per-build basis if it fails.

ah, alright.