[Analyzer] More granular special casing in RetainCountChecker
[Analyzer] More granular special casing in RetainCountChecker

Only assume that IOBSDNameMatching and friends increment a reference counter
if their return type is a CFMutableDictionaryRef.

Differential Revision: https://reviews.llvm.org/D38487

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@314820 91177308-0d34-0410-b5e6-96231b3b80d8

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