[wwwdocs, patch] gcc-4.9/changes.html: Add quip about "#pragma GCC ivdep" and update Fortran section

[Tobias Burnus]

Dear Gerald, dear all,

the patch adds a quip about the new "#pragma GCC ivdep" to the release 
notes. Additionally, I updated the Fortran section based on the changes 
accumulated on http://gcc.gnu.org/wiki/GFortran#news

Any comments? Or is the patch OK?

Tobias
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