[PATCH] Update tail-merge header comment.

[Tom de Vries]

Steven,

I answered your question in tree-ssa-tail-merge.c about why tail-merge is not a
stand-alone gimple pass.

Committed to trunk.

Thanks,
- Tom

2013-04-29  Tom de Vries  <t...@codesourcery.com>

        * tree-ssa-tail-merge.c: Update header comment.