AMDGPU: Hack for VS_32 register pressure
For some reason VS_32 ends up factoring into the pressure heuristics
even though we should never see a virtual register with this class.
When SGPRs are reserved for register spilling, this for some reason
triggers reg-crit scheduling.
Setting isAllocatable = 0 may help with this since that seems to remove
it from the default implementation's generated table.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252321
91177308-0d34-0410-b5e6-
96231b3b80d8
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