Bytes should be decoded from top bytes first

E.g. if I input 0x20212020 https://luplab.gitlab.io/rvcodecjs/#q=0x20212020&abi=false&isa=AUTO imo it should display information for 0x2021 c.jal, not 0x2020 c.fld

I guess it's part of general problem of not being able to input multiple instructions, since 0x0000006f0000006f https://luplab.gitlab.io/rvcodecjs/#q=0x0000006f0000006f&abi=false&isa=AUTO fails to parse input at all