[PATCH] don't confuse user when OOM happens

[Nathan Sidwell]

The thread at https://gcc.gnu.org/ml/gcc/2017-08/msg00090.html discusses 
the driver behaviour when OOM kills cc1plus or whatever.

This patch changes the driver so that if the inferior dies via INT, 
TERM, QUIT or KILL signals,  it emits a clearer message about what happened.

We've been using this patch inside Facebook for a while, and it's cut 
down on OOM-related bug reports.  So works for me :)

ok?

nathan

-- 
Nathan Sidwell
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