sim: ppc: switch register read/writes to union to avoid aliasing issues

This code creates a small buffer on the stack w/alloca, then proceeds to
write to it with a cast to a pointer type based on the register type, then
reads from it with a cast to a pointer type based on the register size.
gcc will flags only one of these lines as "maybe used uninitialized", but
it seems to track back to this memory abuse.

Create a large union with all the possible types that this code will read
or write as, and then use those.  It's a bit ugly, but is probably better
than using raw memcpy's everywhere.

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