tcg/tci: Restrict TCG_TARGET_NB_REGS to 16

As noted in several comments, 8 regs is not enough for 32-bit
to perform calls, as currently implemented.  Shortly, we will
rearrange the encoding which will make 32 regs impossible.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2 files changed