[PATCH, GCC] Improve comment for struct symbolic_number in bswap pass

[Thomas Preudhomme]

Hi,

The current comment for struct symbolic_number in the bswap pass code 
(tree-ssa-math-opts.c) does not explain all of the fields in the structure. It 
is also a bit unclear at times. This patch rewrites the comment to fix those. 
Note: it depends on the fix for PR77673 to be installed first.

ChangeLog entry is as follows:

*** gcc/ChangeLog ***

2016-11-22  Thomas Preud'homme  <thomas.preudhomme@arm.com>

         * tree-ssa-math-opts.c (struct symbolic_number): Improve comment.


Is this ok for trunk?

Best regards,

Thomas
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