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i#1312 AVX-512 support: Add 64 bytes of opmask storage to priv_mcontext_t.

Merged Hendrik Greving requested to merge i1312-add-opmask-context-structure into master

Adds an opmask field to mcontext, to be used to save the opmask registers of AVX-512 during a context switch.

Adjusts all offsets and adds the define MCXT_TOTAL_OPMASK_SLOTS_SIZE.

Fixes the test protect-dstack.

Adds backward compatibility support incl. for builds before f9c8364f.

Issue: #1312