[llvm] [AMDGPU] using loop to define data type convert patterns (PR #132899)

[via llvm-commits]

Shoreshen wrote:

> And should still drop the test changes, and leave this as an NFC refactoring only

Hi @arsenm , please see this PR: https://github.com/llvm/llvm-project/pull/133052

All tests passed and reasons are listed.. Thanks

https://github.com/llvm/llvm-project/pull/132899