Part of this test file was stolen from D156895. We should merge them
when committing.
Reviewed By: asb
Differential Revision: https://reviews.llvm.org/D156926
These test cases previously caused an error. RISCVInstrInfo::copyPhysReg also needed a tweak in order to account for copying bf16 values in FPR16 registers.
Differential Revision: https://reviews.llvm.org/D156883