[AMDGPU] Simplify `GCNRegPressure::RegKind` (NFC) (#142682) This NFC simplifies the `GCNRegPressure::RegKind` enum so that instead of containing a pair of values for each type of register (one for non-tuple registers and one for tuple registers of that type) it only contains one value representing all registers of that type. The `GCNRegPressure::Value` array is still sized as before, though all elements corresponding to tuple-kinds now start after all elements corresponding to non-tuple-kinds instead of the two being interleaved. This allows to simplify the `GCNRegPressure::inc` logic, eliminating the switch entirely.
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