[clang] [alpha.webkit.NoUnretainedMemberChecker] Recognize NS_REQUIRES_PROPERTY_DEFINITIONS (PR #141293)

[Ryosuke Niwa via cfe-commits]

rniwa wrote:

There was a typo in the branch name so closing this in favor of a new PR: https://github.com/llvm/llvm-project/pull/143408

https://github.com/llvm/llvm-project/pull/141293