PCH support on Solaris

[Eric Botcazou]

> Will it work to simply do
>
> addr = mmap (mmi.preferred_base - mmi.offset, mmi.size, PROT_READ,
> MAP_PRIVATE fd, mmi.offset);
>
> on Solaris?  Or will preferred_base need to have mmi.offset added into
> it when generating the PCH?

The former solution appears to work (all pch tests pass) but it is obvioulsy 
fragile.

I've also tested Paolo's solution (patch attached) and it appears to work 
too.

So I propose to implement a 3-stage heuristics:
- direct heuristics: (mmi.preferred_base, mmi.offset),
- Solaris-specific heuristics: (mmi.preferred_base - mmi.offset, mmi.offset)
- MAP_FIXED heuristics: (mmi.preferred_base, 0) then (mmi.preferred_base, 
mmi.offset) with MAP_FIXED.

-- 
Eric Botcazou
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