RTEMS | cpukit/score/cpu/i386: The illegal instruction and the context validation (#5697)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5697



`_CPU_Instruction_illegal()` emits a `.word 0`. The two zero bytes are the
encoding of an add instruction on x86, so nothing is raised and the caller runs
on. `spfatal26` asserts right behind the call. `_CPU_Context_validate()` and
`_CPU_Context_volatile_clobber()` are stubs, so `spcontext01` cannot detect a
defect in the context switch.

Found while running the full test suite on Qemu. This description was created
with Claude Code assistance.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5697
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