It's a bit strange that we have `Assembler::_and_imm12` and `MacroAssembler::andi`. This is different from friends
`Assembler::ori` and `Assembler::xori`. And it doesn't seem necessary to have this `MacroAssembler::andi` as I find
the immediate is within 12-bit range for most of the cases. There is only one exception in file sharedRuntime_riscv.cpp
where we can do `mv` and `andr` instead.