[OPENMP]Simplify the check for the predefined allocators, NFC.
[OPENMP]Simplify the check for the predefined allocators, NFC.

Previously implemented check required the reevaluation of the already
evaluated predefined allocator kind for the global variables. Patch
simplifies this evaluation and removes extra code.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@356699 91177308-0d34-0410-b5e6-96231b3b80d8

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