Fix pr 41469

[Richard Henderson]

A case of -O0 not removing all the dead code, leaving a RESX around. 
The cleanup_eh pass proved that the region wasn't reachable, and deleted 
the landing pad, expecting dead code elimination to remove the RESX.

Solved by expanding unreachable RESX to __builtin_trap, and a big fat 
comment.

Tested on x86-64-linux.


r~
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