Revert r326782 "[analyzer] CStringChecker.cpp: Remove the duplicated check...".
Revert r326782 "[analyzer] CStringChecker.cpp: Remove the duplicated check...".

It seems that the refactoring was causing a functional change and some warnings
have disappeared.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@328067 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang