-Warc-repeated-use-of-weak: look through explicit casts on assigned values.

Reading from a weak property, casting the result, and assigning to a
strong pointer should still be considered safe.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165629 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed