Revert "Add a verbose mode to "image dump line-table" and use it to write a .debug_line test"

This reverts commit r350802 because the test fails on windows. This
happens because we treat the paths as windows paths even though they
have linux path separators in the asm file. That results in wrong paths
being computed (\tmp\tmp\a.c instead of /tmp/a.c).

Reverting until I can figure out what to do with this.

llvm-svn: 350810