Add module dependencies with -MD, -MMD

[Ben Langmuir]

This patch adds module dependencies to the dependency files created by -MD/-MMD/etc.  It does so by attaching an ASTReaderListener that will call into the dependency file generator when a module input file is seen in the serialized AST.  In order to add/not add system headers appropriately, the IsSystem flag from the clang::Module is passed through the ASTReader and ModuleFile.  There was also an addition to allow chaining ASTReaderListeners (let me know if you’d prefer that to be a separate patch).

Ben

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