os to "ios" or "macosx" if it is unspecified. For environments
where there genuinely is no os, we don't want to errantly
convert that to ios/macosx, e.g. bare board debugging.
Change PlatformRemoteiOS, PlatformRemoteAppleWatch, and
PlatformRemoteAppleTV to not create themselves if we have
an unspecified OS. Same problem - these are not appropriate
platforms for bare board debugging environments.
Have Process::Attach's logging take place if either
process or target logging is enabled.
<rdar://problem/25592378>
llvm-svn: 265732