[PATCH] Enable -mcpu=power6 for PowerPC

[Peter Steinmetz]

This patch enables new mcpu and mtune options for PowerPC power6.  The
options will be an alias for power5+ with the addition of Altivec.  The
affect of these options will be expanded when more technical details are
released by IBM.

Bootstrapped and regtested on powerpc64-unknown-linux-gnu

Ok for mainline?

(See attached file: patch.power6)

Thanks, Pete
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