Fix t/t_select_index2 test.
tests: For icarus, exit on stop. Merge from RPORTER/vpi-vpiSize-680.

Signed-off-by: Wilson Snyder <wsnyder@wsnyder.org>
Fix vpi_get of vpiSize, bug680.

Signed-off-by: Wilson Snyder <wsnyder@wsnyder.org>
Merge branch 'master' into issue-677-loop-unroll