biarch support for 2.6, missing kdb pieces

[Anton Blanchard]

> No.  mtcrf syntax is the same in both power4 and non-power4 versions.
> The only difference is that with -mcpu=power4 the assembler sets
> bit 1<<20 of the insn if exactly one cr field is being set.

So there is no way I can force it in assembly? We have a code path that
is performance critical (SLB reload) and only executed by POWER4 machines,
Id like that to use the fast mtcrf even if the rest of the kernel does not.

Anton

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