Fix VS2013 build of CGOpenMPRuntime.cpp
Fix VS2013 build of CGOpenMPRuntime.cpp

It seems the compiler was getting confused by the in-class initializers
in local struct MapInfo, so moving those to a default constructor
instead.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@277256 91177308-0d34-0410-b5e6-96231b3b80d8

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