[llvm] [AArch64] Make use of byte FPR stores for bytes extracted from vectors (PR #131793)

[Paul Walker via llvm-commits]

paulwalker-arm wrote:

Sure but I would rather implement isel for a truncating store that might be generically useful (perhaps even allowing some cleanup of existing isel patterns) than going down the route of needing to create a dedicated MVT for this one use case.

https://github.com/llvm/llvm-project/pull/131793