AMDGPU/GlobalISel: Use SReg_32 for readfirstlane constraining
This matches the DAG behavior where we don't use SReg_32_XM0 everywhere anymore, and fixes not coalescing the copies into m0.
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This matches the DAG behavior where we don't use SReg_32_XM0 everywhere anymore, and fixes not coalescing the copies into m0.