tcg-ppc64: Handle long offsets better

Previously we'd only handle 16-bit offsets from memory operand without falling
back to indexed, but it's easy to use ADDIS to handle full 32-bit offsets.

This also lets us unify code that existed inline in tcg_out_op for handling
addition of large constants.

The new R2 temporary was marked reserved for the AIX calling convention, but
the register really is call-clobbered and since tcg generated code has no use
for a TOC, it's available for use.

Signed-off-by: Richard Henderson <rth@twiddle.net>

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