jemalloc on ppc32: Missing implementation for 32-bit atomic operations

[Ingvar Hagelund]

* Jason
> gcc added intrinsics for atomic operations sometime in the 4.x series
> (4.4.x certainly has them), which jemalloc tries to use

Okay, no worries with fedora/rhel6 on ppc then.

> so chances are that you are using a newer compiler on the ppc64
> system than on the 32-bit system. 

Yes, this ppc32 box is a virtual environment running rhel4.

> I added native implementations for x86/x64 systems, but
> haven't had the time to do so for PowerPC (plus I don't have ppc
> hardware anymore).

If the code appears, I can test it on my boxes.

Ingvar