[Coroutines] [CodeGen] Don't change AST in CodeGen/Coroutines

The root source of other odd bugs.

We performed a hack in CodeGen/Coroutines. But we didn't recognize that
the CodeGen is a consumer of AST. The CodeGen shouldn't change AST in
any ways. It'll break the assumption about the ASTConsumer in Clang's
framework, which may break any other clang-based tools which depends on
multiple consumers to work together.

The fix here is simple. But I am not super happy about the test. It is
too specific and verbose. We can remove this if we can get the signature
of the AST in ASTContext.

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