[Bug c++/87373] Packed structs are not handled properly on ARM architecture even with misaligned access is enabled

[murat.ursavas at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87373

--- Comment #16 from Murat Ursavaş <murat.ursavas at gmail dot com> ---
OK I understand conservative action and not wait for word by word access. But
the resulting value is not 0x401 on the test case, but it should be.

In my original case this was effecting a USART peripheral register and it was
activating different switches and making the peripheral useless. 

To make the case worse, if you assign some important physical pins on the same
port, this bug can make them work differently. Let's say, it can pull a trigger
without intention, because GPIO peripherals simply waits for bit assignments.