[lldb-mi] Fix the handling of files in -data-info-line and -symbol-list-lines.

This fixes -data-info-line and -symbol-list-lines to parse the filename
and line correctly when line entries don't have the optional column
number and the filename contains a Windows drive letter. It also fixes
-symbol-list-lines when code from header files is generated.

Reviewed by: abidh, ki.stfu
Subscribers: lldb-commits
Differential Revision: http://reviews.llvm.org/D12115

llvm-svn: 247899