`t2{LDR,STR}{*}_{PRE,POST}_imm` is pseudo instruction and is expected to
be `t2{LDR,STR}{*}_{PRE,POST}`. During building the new MCInst of
`t2{LDR,STR}{*}_{PRE,POST}`, the order of operands looks incorrect.
Fixes https://github.com/llvm/llvm-project/issues/97020.
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Co-authored-by: Kai Luo <luokai@vivo.com>