tcg: Use TCGMemOp for TCGLabelQemuLdst.opc

Signed-off-by: Richard Henderson <rth@twiddle.net>
tcg-ppc: Use TCGMemOp within qemu_ldst routines

Signed-off-by: Richard Henderson <rth@twiddle.net>
tcg-ppc64: Use TCGMemOp within qemu_ldst routines

Signed-off-by: Richard Henderson <rth@twiddle.net>
tcg-ppc: Convert to le/be ldst helpers

Signed-off-by: Richard Henderson <rth@twiddle.net>
tcg-ppc64: Convert to le/be ldst helpers

Signed-off-by: Richard Henderson <rth@twiddle.net>
tcg-ppc: Support new ldst opcodes

Signed-off-by: Richard Henderson <rth@twiddle.net>
tcg-ppc64: Support new ldst opcodes

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