[llvm] [AArch64LoadStoreOpt] BaseReg update is searched also in CF successor (PR #145583)

[Sergey Shcherbinin via llvm-commits]

SergeyShch01 wrote:

All green, one approval from @john-brawn-arm .  
Commit message below—please squash-and-merge for me, thanks!

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[AArch64LoadStoreOpt] BaseReg update is searched also in CF successor

Look for reg update instruction (to merge w/ mem instruction into pre/post-increment form) not only inside a single MBB but also along a CF path going downward w/o side enters such that BaseReg is alive along it but not at its exits.

Regression test is updated accordingly.
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https://github.com/llvm/llvm-project/pull/145583