Stanislav Mekhanoshin cfe9a134bb [AMDGPU] Rename 64BitDPP feature and fix the checks ...

Names '64BitDPP' and especially 'DPP64' were found misleading, and
DPP64 can easily be mixed with DPP16 and DPP8 while these are
different concepts. DPP16 and DPP8 refers to lanes where DPP64
refers to the operand size.

In fact the essential part here is that these instructions are
executed on the DP ALU, so rename the feature accordingly.

I have also found a bug in a check for these instructions, which is
fixed here and a common utility function is now used.

Differential Revision: https://reviews.llvm.org/D158465

2023-08-22 11:00:10 -07:00

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