express library-level dependencies within Clang.

This is no more verbose really, and plays nicer with the rest of the
CMake facilities. It should also have no change in functionality.

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Show how to actually use the arguments it has.


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This removes the final dependency edge from any lib outside of CodeGen
to core.  As a result we can, and do, trim the dependency on core
from libclang, PrintFunctionNames, the unit tests and c-index-test.
While at it, review and trim other unneeded dependencies.

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[analyzer] Introduce libclangStaticAnalyzerFrontend and move Checkers/AnalysisConsumer.cpp into Frontend lib.

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layout.  :)

Rename the 'EntoSA' directories to 'StaticAnalyzer'.

Internally we will still use the 'ento' namespace
for the analyzer engine (unless there are further
sabre rattlings...).

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update Makefile.

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[analyzer] Refactoring: Move checkers into lib/GR/Checkers and their own library, libclangGRCheckers

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This reverts commit r113631

Conflicts:

	CMakeLists.txt
	lib/CodeGen/CMakeLists.txt

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of whatever we were using before...

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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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