[PATCH] Pragma Loop constant expression support

[Tyler Nowicki]

Hi,

I am back from my post-internship vacation. Aaron has previously given this
patch a LGTM, but he suggested Richard take a look as well.

@Richard, could you please review this patch.

In follow-up patches I will move CodeGen/pragma-loop.cpp to CodeGenCXX and
use BalancedDelimiterTracker to ensure parens are balanced when parsing the
constant expression. Please email me at tyler.nowicki at gmail.com (not
tnowicki at apple.com).

Thanks,

Tyler Nowicki
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