fix initialization of OverExp::loc
OverExp: use loc of surrounding expression, not the (empty) loc from OverloadSset
fix Issue 9514 - "template instance … is not an alias"
Merge pull request #1665 from 9rnsr/fix9514

Issue 9514 - "template instance … is not an alias"
Merge pull request #1664 from rainers/overexp_loc

fix initialization of OverExp::loc