By inspection, obviously we should be storing T[1] not T[0].
This could only happen for x86_64 in 64-bit mode with 0x66
prefix to call insn -- i.e. never.
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NRichard Henderson <rth@twiddle.net>