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amd64: stop using top of the thread' kernel stack for FPU user save area

Description

amd64: stop using top of the thread' kernel stack for FPU user save area

MFC note: this commit changes layout of td_md for amd64, resulting in
static checks for struct thread ABI in kern_thread.c to fail. Next
two commits restore the layout, I decided to not overcomplicate the
merge and not do the work that is going to be overwritten immediately.

(cherry picked from commit df8dd6025af88a99d34f549fa9591a9b8f9b75b1)

Details

Provenance
kibAuthored on Sep 13 2021, 9:05 PM
Parents
rG45e930db73af: linux32: add a hack to avoid redefining the type of the savefpu tag
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