[llvm] [RISCV] Use `experimental-p` extension for zero-extended narrow unsigned types (PR #213260)

[Rajveer Singh Bharadwaj via llvm-commits]

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Rajveer100 wrote:

That's the trade-off I believe, we get much better performance with p-extension despite it increasing code size.

https://github.com/llvm/llvm-project/pull/213260