RISC-V Assertion failure in SelectionDagBuilder.cpp when compiling CheriBSD-compiler-rt with 128bit intrinsics: `(PartVT.isInteger() || PartVT == MVT::x86mmx) && ValueVT.isInteger() && "Unknown mismatch!"'

RISC-V Assertion failure in SelectionDagBuilder.cpp when compiling CheriBSD-compiler-rt with 128bit intrinsics: `(PartVT.isInteger() || PartVT == MVT::x86mmx) && ValueVT.isInteger() && "Unknown mismatch!"' #20