target-xtensa: implement unaligned exception option
See ISA, 4.4.4 for details. Correct (aligned as per ISA) address for unaligned access is generated in case this option is not enabled. Signed-off-by: NMax Filippov <jcmvbkbc@gmail.com> Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
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