This patch adds initial support for AMD Zen 6 architecture (znver6): - Added znver6 CPU target recognition in Clang and LLVM - Updated compiler-rt CPU model detection for znver6 - Added znver6 to target parser and host CPU detection - Added znver6 to various optimizer tests znver6 features: FP16, AVXVNNIINT8, AVXNECONVERT, AVXIFMA (without BMM).