powerpc: Emulate vector element load/store instructions

This adds code to analyse_instr() and emulate_step() to handle the
vector element loads and stores:

lvebx, lvehx, lvewx, stvebx, stvehx, stvewx.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>