When applying ARC __weak to a non-objc pointer, do not give error that
__weak is unsupported by the deployment target, since it is going to be
ignored anyway.

Makes it easier for incremental migration from GC.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@143975 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed