[CodeView] Improve the line table dumper

[CodeView] Improve the line table dumper

This change has us print out fields we didn't previously understand.  To
improve readability, we now group column information with it's
respective line.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257552 91177308-0d34-0410-b5e6-96231b3b80d8