As pointed out in cf1ec32e, AVX-512 context management by DynamoRIO is not fully supported or is untested on non-UNIX as well as on 32-bit builds. Yet processor detection and certain AVX-512 functionality was enabled on those builds when running on machines with AVX-512 support enabled by the OS. This was causing problems (xref #3949 (closed)). For now, this patch completely disables all AVX-512 features on unsupported and untested builds.
Fixes #3949 (closed) Issue: #1312