ma_lines: Make sure the custom compiler pass is after all IPA passes

It is more convenient here if the custom compilation pass implemented
by this plugin is run after all inlining and IPA (inter-procedure
analysis) passes. The information about globals and locals, escaping
and non-escaping objects is more accurate there then after "ssa" pass
the custom pass was placed after before this commit.

For some reason, GCC 4.9 does not allow to place the custom pass right
after "inline" or "pta" IPA passes. So I placed it right before  the
pass "ehdisp" (pass_lower_eh_dispatch) that is guaranteed to start after
IPA passes complete.
sample_target: Remove the file generated by "ma_lines" on make clean