[PATCH] OpenACC routines -- middle end

[Cesar Philippidis]

Currently GCC lacks support for the bind and nohost clauses in OpenACC
routine. Furthermore, none of the FEs preform much error handling to
detect incompatible acc loops inside those functions.

This patch adds the common middle end components, namely tree codes for
the clauses, and OMP lowering and gimplification code for diagnostics
and code generation. I've also included the changes to c-family, because
I wanted to break out the FE changes into separate patches.

Is this patch OK for trunk?

Cesar

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