[PATCH] Add __raw_visit and __raw_idx_visit, use INVOKE<R>

[Jonathan Wakely]

On 14/05/19 17:46 +0100, Jonathan Wakely wrote:
>This change simplifies visitation for variants, by using INVOKE<R> for
>the visit<R> form, and explicitly specifying the tag types for raw
>visitation, instead of inferring them from the return types of the
>lambda functions used as visitors.

An additional tiny tweak.

Tested powerpc64le-linux, committed to trunk.

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