Retain complete source information for the type after the '~' in a

Retain complete source information for the type after the '~' in a
CXXPseudoDestructorExpr.

Update template instantiation for pseudo-destructor expressions to use
this source information and to make use of
Sema::BuildPseudoDestructorExpr when the base expression is dependent
or refers to a scalar type.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@97079 91177308-0d34-0410-b5e6-96231b3b80d8