[Bug target/63762] [ARM]GCC generates UNPREDICTABLE STR with Rn = Rt when hard-float abi is used

[renlin.li at arm dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63762

--- Comment #1 from Renlin Li <renlin.li at arm dot com> ---
I am starting to work on this issue.