[RISCV] Fix inconsistent usage of ValVT and LocVT in CC_RISCV_Impl. NFCI (#195368)
I think all of our checks should be against LocVT. If LocVT is different
than ValVT, that means the location has already been changed and we
should be acting on that changed type. For the most part, I don't think
that happens for RISC-V.