Add experimental support for amdfam10/barcelona from the GCC 4.3 branch.
Initial support for the AMD barcelona chipsets has been available in the gcc43 branch under GPLv2 but was not included when the Core 2 support was brought to the system gcc.
AMD and some linux distributions (OpenSUSE) did a backport of the amdfam10 support and made them available. Unfortunately this is still experimental and while it can improve performance, enabling the CPUTYPE may break some C++ ports (like clang).
Special care was taken to make sure that the patches predate the GPLv3 switch upstream.
Tested by: Vladimir Kushnir Reviewed by: mm Approved by: jhb (mentor) MFC after: 2 weeks
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