[llvm] [PowerPC] Fix IS_FPCLASS crash on 32-bit AIX targets for fcFinite/fcInf/fcInf|fcNan masks (PR #213298)

[zhijian lin via llvm-commits]

diggerlin wrote:

in your description :

> Since useCRBits=false on PPC32, MVT::i1 is not a legal type, triggering:

I think the  useCRBits=false  , just because you use the -mcpu=pwr7 or low , useCRBits only true after power8 or later.

https://github.com/llvm/llvm-project/pull/213298