[CFG] [analyzer] Find argument constructors in CXXTemporaryObjectExprs.

CXXTemporaryObjectExpr is a sub-class of CXXConstructExpr. If it has arguments
that are structures passed by value, their respective constructors need to be
handled by providing a ConstructionContext, like for regular function calls and
for regular constructors.

Differential Revision: https://reviews.llvm.org/D50487

llvm-svn: 339727