[PATCH] Add support for unroll pragma

[Mark Heffernan]

On Wed, Jul 16, 2014 at 4:57 PM, Richard Smith <richard at metafoo.co.uk>
wrote:

> How about modeling the two options as either an IntegerLiteral or an
> IntegerLiteral within a ParenExpr?
>

Assuming I understand what you're suggesting, using a parenexpr would clean
up the passing of the loophint information from parsing to sema.  However,
there would still be the ugliness of tracking the parens everywhere else,
such as in the loop hint attr.  This tracking would be for the sole purpose
of pretty printing the same syntax as the code.  From what Eli and Aaron
have suggested about pretty printing, it seems that a better tradeoff is to
just drop keeping track of parentheses and always pretty print with parens
as this results in a cleaner implementation.  Reasonable?

Mark
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