[clang] [llvm] [CodeGenPrepare] Failure to hoist bitcast to legal type causes register splitting (PR #207568)

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houngkoungting wrote:

HI @RKSimon  , I've updated the PR based on your feedback. I've switched all test RUN lines to "-passes" and added test coverage for aggregate types (AArch64) and scalable vectors (RISC-V). All check-llvm tests pass cleanly. Please take a look when you have some free time. Thanks!

https://github.com/llvm/llvm-project/pull/207568