Clear entire "location" in value constructor
My recent change to allocate values with "new" may have introduced a
small bug. In particular, the previous code allocated with XCNEW, but
the new code only clears a part of the "location" field in the
constructor. I didn't try very hard to actually trigger a bug here,
the problem remains theoretical.
This patch just arranges to initialize the entire location.
Regression tested by the buildbot.
2018-05-25 Tom Tromey <tom@tromey.com>
* value.c (value::location): Initialize.