MFC 284324,290164:

Workaround debuggers that try to read the full 32-bit words holding
selectors in trapframes.

284324:
Ensure that the upper 16 bits of segment registers manually saved in
trapframes are cleared by explicitly pushing a zero and then moving
the segment register into the low 16 bits.  Certain Intel processors
treat a push of a segment register as a move of the segment register
into the low 16 bits leaving the upper 16 bits of the word in the
stack unchanged.

290164:
Use movw instead of movl (or plain mov) when moving segment registers
into memory.  This is a nop on clang's assembler, but some assemblers
complain if the size suffix is incorrect.

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