[Support] Move syntax highlighting into support

Move the DWARF syntax highlighting into support. This has several
advantages, most notably that this makes the WithColor RAII wrapper
available outside libDebugInfo. Furthermore, several projects all have
their own code for handling colored output. This provides a place to
centralize it.

Differential revision: https://reviews.llvm.org/D44215

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327108 91177308-0d34-0410-b5e6-96231b3b80d8
9 files changed