[llvm] [AMDGPU][MC] update USER_SGPR_COUNT bits for GFX1250 (PR #192579)

[Matt Arsenault via llvm-commits]

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+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1250 < %s -o - | llvm-mc -triple=amdgcn-amd-amdhsa -mcpu=gfx1250 -filetype=obj -o - | llvm-readobj --notes -
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arsenm wrote:

Bump on this. Also should have MC parser and error cases in test/MC

https://github.com/llvm/llvm-project/pull/192579