for use in reporting diagnostics.
 - We don't want to use the Action's own CompilerInstance, because that is only
   initialized during file processing and I like that invariant.

Also, if ParseArgs returns false then abandon execution.

Also, remove unused PluginASTAction::PrintHelp virtual method.

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Also, don't link in all the clang libraries statically.


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that loads it, not by linking against them directly.


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Makefiles: Set Clang CPP compiler flags in a single location, instead of scattered throughout the project Makefiles.

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 - This eliminates most dependencies on how Clang is installed relative to LLVM.

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Clang can load it as a plugin. Original fix by Troy D. Straszheim,
which I extended with Darwin support. Fixes PR6801.


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 - The build scriptage is about twice as long as the code, which is nice. :)

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