[WinEH] Fix a build issue in CGException.cpp
[WinEH] Fix a build issue in CGException.cpp

I was constructing an object without filling in all the fields.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@247851 91177308-0d34-0410-b5e6-96231b3b80d8

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