fixup! exec: Add both big- and little-endian memory helpers
tcg-arm: Convert to le/be ldst helpers

Signed-off-by: Richard Henderson <rth@twiddle.net>
tcg-arm: Tidy variable naming convention in qemu_ld/st

s/addr_reg2/addrhi/
s/addr_reg/addrlo/
s/data_reg2/datahi/
s/data_reg/datalo/

Signed-off-by: Richard Henderson <rth@twiddle.net>
tcg-arm: Convert to new ldst opcodes

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