[WebKit Checkers] Treat a boxed value as a safe pointer origin (llvm#161133)

(cherry picked from commit e166816)

Author: rniwa

clang/lib/StaticAnalyzer/Checkers/WebKit/ASTUtils.cpp

@@ -208,6 +208,8 @@ bool tryToFindPtrOrigin(
       continue;
     }
     if (auto *BoxedExpr = dyn_cast<ObjCBoxedExpr>(E)) {
+      if (StopAtFirstRefCountedObj)
+        return callback(BoxedExpr, true);
       E = BoxedExpr->getSubExpr();
       continue;
     }

clang/test/Analysis/Checkers/WebKit/unretained-call-args.mm

@@ -398,12 +398,18 @@ void foo() {
   void baz(const NSDictionary *);
   void boo(NSNumber *);
   void boo(CFTypeRef);
-  void foo() {
+
+  struct Details {
+    int value;
+  };
+
+  void foo(Details* details) {
     CFArrayCreateMutable(kCFAllocatorDefault, 10);
     bar(@[@"hello"]);
     baz(@{@"hello": @3});
     boo(@YES);
     boo(@NO);
+    boo(@(details->value));
   }
 }