Fix for failing test from sanitizer-x86_64-linux-fast where there was a left shift on a negative value.
Fix for failing test from sanitizer-x86_64-linux-fast where there was a
left shift on a negative value.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@339037 91177308-0d34-0410-b5e6-96231b3b80d8

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