[PR63762]GCC generates UNPREDICTABLE STR with Rn = Rt for arm

[Ramana Radhakrishnan]

>> A testcase is added for all targets as I think it's a middle-end
>> issue. And sorry for not being able to simplify it.
>> arm-none-eabi has been test on the model, no new issues. bootstrapping
>> and regression tested on x86, no new issues.
>>
>> Is it Okay to commit?
> Yes.  Thanks very much for working on it and fixing it.

Isn't this something that should be considered for the 4.9 branch as the 
bug was reported there ?

Ramana

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