[clang] [CIR] Support load/store for Vector of bools (PR #212146)

[Andy Kaylor via cfe-commits]

https://github.com/andykaylor commented:

I'm not sure this is the representation we want. Why wouldn't we want to represent a vector of bools as `!cir.vector<8 x !cir.bool>`? We would need to lower this to an integer representation later, but it seems like we'd want to preserve the vector type in CIR, just as we do for scalar bools and bitints.

https://github.com/llvm/llvm-project/pull/212146