arm: intreadwrite: revert 16-bit load asm to old version for gcc < 4.6
Commit adebad07 "arm: intreadwrite: fix inline asm constraints for gcc 4.6 and later" caused some older gcc versions to miscompile code. This reverts to the old version of the code for these compilers. Signed-off-by: NMans Rullgard <mans@mansr.com>
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