Move the diagnostic level printing into a class static helper. This will
allow the TextDiagnosticPrinter to continue using it even if
TextDiagnostic is implemented in a separate file.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142084 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed