[PATCH] Treat -g1 as -gline-tables-only

[hfinkel at anl.gov]

Hi echristo, dblaikie,

To follow-up on this thread on cfe-dev: http://lists.cs.uiuc.edu/pipermail/cfe-dev/2014-October/039649.html

-g1 on gcc (and also IBM's xlc) are documented to be very similar to -gline-tables-only. Our -gline-tables-only might still be more verbose than -g1 on other compilers, but currently we treat -g1 as -g, and so we're producing much more debug info at -g1 than everybody else. Treating -g1 as -gline-tables-only brings us much closer to what everyone else is doing.

http://reviews.llvm.org/D5862

Files:
  lib/Driver/Tools.cpp
  test/Driver/debug-options.c
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