[google][4.7] Backport Function Multiversioning feature from trunk.

[Sriraman Tallam <tmsriram at google dot com>]

Hi,

   This patch backports the Function Multiversioning feature checked into trunk.
This trunk revisions merged are :
r193204,193486,193555,194730,194818,194828,195584,195967,196033

The links to changes in each revision:

r193204: http://gcc.gnu.org/ml/gcc-patches/2012-11/msg00470.html
r193486: http://gcc.gnu.org/ml/gcc-patches/2012-11/msg00956.html
r193555: http://gcc.gnu.org/ml/gcc-patches/2012-11/msg01369.html
r194730: http://gcc.gnu.org/ml/gcc-patches/2012-12/msg01417.html
r194818: http://gcc.gnu.org/ml/gcc-patches/2013-01/msg00060.html
r194828: http://gcc.gnu.org/ml/gcc-patches/2013-01/msg00070.html
r195584: http://gcc.gnu.org/ml/gcc-patches/2013-01/msg01428.html
r195967: http://gcc.gnu.org/ml/gcc-patches/2013-02/msg00504.html
r196033: http://gcc.gnu.org/ml/gcc-patches/2013-02/msg00659.html

Ok to commit?

Thanks
Sri

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