This patch improves the code reuse of the actions system and adds
several improvements for easier debugging via clang-repl
--debug-only=clang-repl.
The change inimproves the consistency of the TUKind when actions are
handled within a WrapperFrontendAction. In this case instead of falling
back to default TU_Complete, we forward to the TUKind of the ASTContext
which presumably was created by the intended action. This enables the
incremental infrastructure to reuse code.
This patch also clones the first llvm::Module because the first PTU now
can come from -include A.h and the presumption of llvm::Module being
empty does not hold. The changes are a first step to fix the issues with
`clang-repl --cuda`.
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