message: [ExpressionParser] Adjust default clang resource dir for swift
  The previous patch refactored DefaultClangResourceDir and swift-lldb
  puts the clang resource dir in a different location.
diff: @@ -53,9 +53,7 @@ static bool DefaultComputeClangResourceDirectory(FileSpec &lldb_shlib_spec,
  llvm::SmallString<256> clang_dir(parent_dir);
  llvm::SmallString<32> relative_path;
  - llvm::sys::path::append(relative_path,
  - llvm::Twine("lib") + CLANG_LIBDIR_SUFFIX, "clang",
  - CLANG_VERSION_STRING);
  + llvm::sys::path::append(relative_path, "lib", "lldb", "clang");
  llvm::sys::path::append(clang_dir, relative_path);
  if (!verify || VerifyClangPath(clang_dir)) {
  