Copy the Clang resource directly directly from the clang build
Copy the Clang resource directly directly from the clang build

When building a toolchain version of LLDB, build-script will not
create the Swift resource dir. Get the Clang headers directly from
the Clang build.

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb