Only set the point of instantiation for an implicit or explicit
instantiation once we have committed to performing the
instantiation. As part of this, make our makeshift
template-instantiation location information suck slightly less.

Fixes PR5264.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@85209 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed