WebKit checkers should support adoptOSObject()

[fred-wang]

Currently, this is causing a lot of false positive in WebKit code, see WebKit/WebKit#47303

cc @csaavedra @rwlbuis @rniwa @cdumez

[llvmbot]

@llvm/issue-subscribers-clang-static-analyzer

Author: Frédéric Wang (fred-wang)

Currently, this is causing a lot of false positive in WebKit code, see https://github.com/WebKit/WebKit/pull/47303

cc @csaavedra @rwlbuis @rniwa @cdumez

[rniwa]

#159484

[fred-wang]

Fixed by #159484