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Note that PointerUnion::dyn_cast has been soft deprecated in PointerUnion.h: // FIXME: Replace the uses of is(), get() and dyn_cast() with // isa<T>, cast<T> and the llvm::dyn_cast<T> This patch migrates uses of PointerUnion::dyn_cast to dyn_cast_if_present (see the definition of PointerUnion::dyn_cast). Note that we cannot use dyn_cast in any of the migrations in this patch; placing assert(!X.isNull()); just before any of dyn_cast_if_present in this patch triggers some failure in check-clang.