[PATCH] D96320: [ThinLTO, Sanitizers] Skip instrumentation by testing backend

[Arthur Eubanks via Phabricator via cfe-commits]

aeubanks added a comment.

This seems like the wrong fix to me.
ThinLTO only runs the simplification pipeline pre-link, then runs it again plus the optimization pipeline. The optimization pipeline is the only place that OptimizerLastEPCallback should run (aside from the -O0 pipeline). Basically, the OptimizerLastEPCallbacks should only ever run once throughout all of compilation for a given module.

So it seems like LTO should do the same and only run the simplification pipeline pre-link, rather than just forward to `buildPerModuleDefaultPipeline()`, which runs both.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D96320/new/

https://reviews.llvm.org/D96320