[llvm] [SimplifyCFG] Supporting hoisting/sinking callbases with differing attrs (PR #109472)

[via llvm-commits]

goldsteinn wrote:

> IR diff looks good. But we need to avoid redundant copies/computations to reduce the compilation time overhead.

http://llvm-compile-time-tracker.com/compare.php?from=f7c3309b1361443cded697255995fade24838ef8&to=3135761f2c94d10ee10624e11289793345d0d7ce&stat=instructions%3Au

Doesn't seem like its an issue in practice, although I agree there is a fair amount of wasted work.

https://github.com/llvm/llvm-project/pull/109472