[llvm] [NFC][AMDGPU] Convert amdpal.ll to autogenerated CHECK lines (PR #141026)

[Harrison Hao via llvm-commits]

harrisonGPU wrote:

> This test cannot be converted to generated checks. The generated checks only include the instructions in the function body, and none of the metadata. This test only really cares about the metadata

Okay, can I add these Metadata check after using update_llc_test_checks.py?

https://github.com/llvm/llvm-project/pull/141026