[clang] [llvm] [AArch64][GlobalISel] Do not run the Localizer at -O0 (attempt 2) (PR #231406)

[Cullen Rhodes via cfe-commits]

c-rhodes wrote:

> Could the frame-index materializations in the entry block be built with an empty DebugLoc, or could the Localizer stay when the function has debug info?

thanks for reporting, I've not looked in detail yet but this pass should not be necessary for debug-info correctness. It's not the first issue it has exposed either, there were a couple of test failures when it originally landed and one since (#231850), but in all cases there were bad assumptions / flakiness.



https://github.com/llvm/llvm-project/pull/231406