Adjusts the setjmp call from common.decode's assembly to use the pre-parameter-slot stack value, avoiding fatal crashes on longjmp.
Disables test_data16_mbr() on 64-bit Windows, as SEH64 can't handle the unaligned stacks and other oddities of the instructions there. We still have coverage on 64-bit Linux which is sufficient.
Removes the ignore rules on failure for common.decode and common.decode-stress from the runsuite_wrapper.
Issue: #4618