Fix a buildbot failure introduced by r290960.
Fix a buildbot failure introduced by r290960.

The commit r290960 checked the the basic block label name which isn't there
when clang is compiled in release mode.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@290968 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit c9c73f6248f74927e5e11ef358f0cbe600e2fa9e)

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