swift

c3550e81 - [Dependency Scan] Do not pass clang's `-dwarf-debug-flags` to swift

[Dependency Scan] Do not pass clang's `-dwarf-debug-flags` to swift When turning on directCC1 scanning, swift will ask clang driver to expand all cc1 flags and pass that explicitly on command-line. In such case, if `RC_DEBUG_OPTIONS` env is set on darwin platform, it will cause clang driver to encode all the options it gets and pass those clang driver options as a cc1 options `-dwarf-debug-flags`. After the change, swift scanner will no longer generate a long `-Xcc -dwarf-debug-flag -Xcc <long list of flags>` for later compilation. Losing such information in DWARF doesn't affect swift debugging. It will instead, make command-line a lot shorter, save spaces in swift binary module, and make swift caching build more reliable. rdar://144267483