Add libllvm_version to base_h.jl, include in versioninfo() output
Merge pull request #7639 from JuliaLang/sf/llvmversion

Add libllvm_version to base_h.jl, include in versioninfo() output
Add back llvmcall
Import update llvmcall from cxx branch
Fix build for non-MCJIT versions of Julia & Add tests