[llvm] [DAG] Combine `store + vselect` to `masked_store` (PR #145176)

[Jan Wassenberg via llvm-commits]

jan-wassenberg wrote:

It's likely the HWY_NEON_BF16 target. We are able to repro the compiler crash with an UBSAN build and `-march=armv8.2-a+sve`.

https://github.com/llvm/llvm-project/pull/145176