Use full instead of line-table debug info for building the IRT
Use full instead of line-table debug info for building the IRT

Using full debug info used to be prohibitively memory-hungry (e.g. in bitcode
linking), so we reduced it to line tables only. This can
now be done with ~1G of RAM (as opposed to >4G
before) so it's reasonable to switch back.

This also works around a bug that the debug info is nondeterministic with
-gline-tables-only.

BUG= https://code.google.com/p/chromium/issues/detail?id=497904
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/1177043003.

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client