target/arm: Use tcg_constant for predicate descriptors

In these cases, 't' did double-duty as zero source and
temporary destination.  Split the two uses.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20220426163043.100432-46-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
1 file changed