[llvm] [AMDGPU][NFC] Explicitly narrow conversions in libcalls, TTI and InstCombine (PR #215196)

[via llvm-commits]

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gretay-amd wrote:

The fields of Param are packed into one byte. I'll add accessors to Param and move the cast into the accessors.

https://github.com/llvm/llvm-project/pull/215196