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

[Ryosuke Niwa via cfe-commits]

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@@ -142,6 +144,8 @@ class RawPtrRefMemberChecker
     if (auto *ID = dyn_cast<ObjCImplementationDecl>(CD)) {
       for (auto *Ivar : ID->ivars())
         visitIvarDecl(CD, Ivar);
+      for (auto *PropImpl : ID->property_impls())
+        visitPropImpl(CD, PropImpl);
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rniwa wrote:

oh, that must be why my warning is emitted in a seemingly wrong place for one of the test cases. Will fix.

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