[clang] Update `ignoringElidableConstructorCall` matcher to ignore `ExprWithCleanups`.

Summary:
The `ExprWithCleanups` node is added to the AST along with the elidable
CXXConstructExpr.  If it is the outermost node of the node being matched, ignore
it as well.

Reviewers: gribozavr

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D65944

llvm-svn: 368319