Change x86 default arch for 4.5?

[Vincent Lefevre]

On 2010-02-22 00:02:39 +0100, Erik Trulsson wrote:
> On the other hand code compiled for an older CPU that is run a newer
> CPU will run just fine, if slightly slower than they could have due to
> not making use of new instructions in the newer CPU.

It will run, but may give unexpected or even incorrect flaoting-point
results. See the number of duplicates (some of them can involve
double rounding) in:

  http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323

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