Sema: Split out helper from checkForFunctionCall(), NFC
Sema: Split out helper from checkForFunctionCall(), NFC

Split out `hasRecursiveCallInPath()` from `checkForFunctionCall()` to
flatten nesting and clarify the code.  This also simplifies a follow-up
patch that refactors the other logic in `checkForFunctionCall()`.

Patch by Vedant Kumar!

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@243038 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang