Add Syntastic.
Add support for hacking on LLVM.

This adds syntax files for LLVM assembly and tablegen files, along with
a SetupLlvm command to adhere to the LLVM coding style.
Merge branch 'js/add-syntastic'
Merge branch 'add-llvm-support' of https://github.com/jszakmeister/vimfiles
Syntastic seems to lack support for 'vim' filetype.
Update tagbar.

This fixes a path quoting bug present in the current version.