Stanislav Mekhanoshin cb9ae93712 [AMDGPU] Define SGPR_NULL64 register. NFCI. ...

On gfx10+ null register can be used as both 32 and 64 bit operand.
Define a 64 bit version of the register to use during codegen.

Differential Revision: https://reviews.llvm.org/D127527

2022-06-13 13:23:33 -07:00

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