[llvm] [AMDGPU][MC] Allow UC_VERSION_* constant reuse (PR #96461)

[Carl Ritson via llvm-commits]

perlfu wrote:

> can you add a test for the user redefined case

This might be difficult.
The main issue we are seeing right now is a tool that ends up initializing multiple disassembler instance on the same context.
We can probably replicate this in a unit test if necessary.


https://github.com/llvm/llvm-project/pull/96461