[alpha.webkit.NoDeleteChecker] Allow a temporary Ref/RefPtr when the result is kept alive (#219074) Creating a temporary Ref/RefPtr is ordinarily treated as a potentially destructive operation because the destructor could call deref for the last time and destruct the object. However, when such a temporary Ref/RefPtr is immediately converted to another Ref/RefPtr, such a destruction will never take place and therefore safe. This PR adds the logic to detect this case when handling CXXConstructExpr and allow it in alpha.webkit.NoDeleteChecker and in other WebKit checkers which check "triviality" of given code.
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