[llvm] [AMDGPU] Run AMDGPULowerVGPREncoding before hazard recognizers. NFCI. (PR #184987)

[Jay Foad via llvm-commits]

jayfoad wrote:

Abandoning because some hazard mitigations generate VALU instructions that require VGPR lowering to be run afterwards, for example: https://github.com/llvm/llvm-project/pull/184904#issuecomment-4027116864

https://github.com/llvm/llvm-project/pull/184987