implement support for attribute(unavailable) on objc methods. This implements gcc/testsuite/objc.dg/method-attribute-1.m
implement support for attribute(unavailable) on objc methods.
This implements gcc/testsuite/objc.dg/method-attribute-1.m


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@64581 91177308-0d34-0410-b5e6-96231b3b80d8

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