CodeGen: clean up -Wpedantic warning (NFC)
CodeGen: clean up -Wpedantic warning (NFC)

  lib/CodeGen/CGExpr.cpp:2511:2: warning: extra ';' [-Wpedantic]
   };
    ^

Clean up warning from gcc 6.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@289514 91177308-0d34-0410-b5e6-96231b3b80d8

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