[analyzer] Remove duplicate work on deriving method behavior. No functionality change.
The cocoa::deriveNamingConventions helper is just using method families anyway now, and the way RetainSummaryTemplate works means we're allocating an extra summary for every method with a relevant family.
Also, fix RetainSummaryTemplate to do the right thing w/r/t annotating an /existing/ summary. This was probably the real cause of <rdar://problem/
10824732> and the fix in r152448.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152998
91177308-0d34-0410-b5e6-
96231b3b80d8