Refactor unaligned STM in old style error return
Don't rely on an STM with either of the bottom 2 bits set to store on a word aligned boundary any more. Fixes abort when an old style error is reported to FileCore on ARMv7. Spotted by Jon Abbott, ref https://www.riscosopen.org/forum/forums/4/topics/3682 Version 3.68. Tagged as 'FileCore-3_68'
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