Changes to ghc

Changes to ghc:
commit 053a9d15031b0b33adc77eaadc5536a43dc7de33
Author: Simon Peyton Jones <simonpj@microsoft.com>
Date:   Tue Dec 31 21:25:19 2013 +0000

    Handle parens in predicates when converting to TH

    This fixes Trac #8625