[llvm] [TableGen] Add a bitvector of members of CodeGenRegisterClass (PR #149122)

[Jay Foad via llvm-commits]

jayfoad wrote:

I tried measuring peak memory usage using:
```
/usr/bin/time -v llvm-tblgen -gen-register-info -I include -I lib/Target/AMDGPU lib/Target/AMDGPU/AMDGPU.td
```
I couldn't measure any increase from this patch. The results fluctuate by around +/- 0.1% anyway so I guess it is lost in the noise.

https://github.com/llvm/llvm-project/pull/149122