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i#1312 AVX-512 support: Add get_opmask_caller_saved() function.

Merged Hendrik Greving requested to merge i1312-add-get_opmask_caller_saved_plus_test into master

Adds function get_opmask_caller_saved() that saves 16-bit AVX-512 OpMask registers to a buffer. It still lacks support for AVX512BW, which will save 64-bit registers.

Adds a test for get_opmask_caller_saved().

Adds the define MCXT_NUM_OPMASK_SLOTS that will also be used for a future structure in DynamoRIO's mcontext.

Adds a missing release note that dr_zmm_t was added and adds release notes for this patch.

Issue: #1312