Objective-C ARC lifetime qualifiers are dropped when canonicalizing
function types. Perform the same adjustment before comparing the
deduced result types of lambdas. Fixes rdar://problem/22344904.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@249065 91177308-0d34-0410-b5e6-96231b3b80d8