[PATCH] D120536: [Sample-PGO] Emit FS discriminators only when -fdebug-info-for-profiling is set

[Rong Xu via Phabricator via llvm-commits]

xur added a comment.

Another way to do this is to check PGOOpt->DebugInfoForProfiling in TargetPassConfig before adding the passes.
That would be the same as IR level addDiscriminator.

But since PGOOpt might not be set for some invocations (like in the unit tests). I would need to introduce 
an extra internal option.

I think the change is this patch is simpler.


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