[PATCH] D150148: [IPO] Opt-in local clones for thinlto imports

[Mircea Trofin via Phabricator via llvm-commits]

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ThinLTO imports (which appear as `available_externally`) that survive
inlining get deleted. With today's inliner that's reasonable, because
the way the function would be inlined into in other modules would be the
same - because of the bottom-up traversal assumption, and the fact that
the inliner doesn't take into account surrounding context [*]. The
ModuleInliner invalidates the first assumption, and the ML inliner the
second.

This patch adds a way to opt-in a module to keep its variant of an
imported function, even if it survived past inlining.

[X] Almost. Deferred inlining is an exception which can lead to

(empirically) infrequent discrepancies.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D150148

Files:
  llvm/lib/Transforms/IPO/ElimAvailExtern.cpp
  llvm/test/Transforms/EliminateAvailableExternally/transform-to-local.ll

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