[analyzer] Handle CXXTemporaryObjectExprs in compound literals.

[analyzer] Handle CXXTemporaryObjectExprs in compound literals.

This occurs because in C++11 the compound literal syntax can trigger a
constructor call via list-initialization. That is, "Point{x, y}" and
"(Point){x, y}" end up being equivalent. If this occurs, the inner
CXXConstructExpr will have already handled the object construction; the
CompoundLiteralExpr just needs to propagate that value forwards.

<rdar://problem/13804098>

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181213 91177308-0d34-0410-b5e6-96231b3b80d8