[lldbsuite] Build with -gdwarf on Windows
[lldbsuite] Build with -gdwarf on Windows

Earlier this month there was a change in clang that defaulted to using codeview rather than dwarf on Windows. Since all the tests rely on dwarf, we need to explicitly request dwarf when building on Windows.

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@347924 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb