Add llvm role

roles/llvm/tasks/Darwin.yaml

@@ -1,5 +0,0 @@
----
-- name: install homebrew package
-  homebrew:
-    name: llvm
-    state: latest

roles/llvm/tasks/Ubuntu-18.04.yaml

@@ -31,7 +31,6 @@
     path: '/usr/local/lib/{{package_name}}'
     state: directory
 
-# TODO: don't extract when not actually doing a n update
 - name: extract release archive
   become: true
   unarchive:
@@ -46,5 +45,3 @@
     dest: '/usr/local/bin/{{item | basename}}'
     state: link
   with_fileglob: '/usr/local/lib/{{package_name}}/bin/*'
-
-# TODO: cleanup old installs?

roles/llvm/tasks/Windows.yaml

@@ -1,5 +0,0 @@
----
-- name: install chocolatey package
-  win_chocolatey:
-    name: llvm
-    state: latest