[RISCV] Add more tests for SHLFI and UNSHFLI aliaes in Zbp extension

RV32/RV64:
zip.n/zip2.b/zip.b/zip4.h/zip2.h/zip.h
unzip.n/unzip2.b/unzip.b/unzip4.h/unzip2.h/unzip.h

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D120241