Erich Focht

LLVMInitializeAllTargets in LLVMExtra pulls in target dependent symbols

1

When working on a port to a new architecture I encountered errors like ``` ../builds/julia-ve/usr/bin/julia: relocation error: /home/focht/.julia/scratchspaces/dad2f222-ce93-54a1-a47d-0025e8a3acab/build/lib/libLLVMExtra-13.so: symbol LLVMInitializeNVPTXTargetInfo, version JL_LLVM_13.0 not defined in file libLLVM-13jl.so with link time...

Added export method to save matrix data in weights as bfloat16 while saving the rest as fp32. The `--version` value must be set to -1 (preliminary). Only the legacy export...