tcg-alpha: Fix type mismatch errors in cpu_signal_handler.

Signed-off-by: Richard Henderson <rth@twiddle.net>
tcg-alpha: New TCG target.

This began with a patch from Dong Weiyu <cidentifier@yahoo.com.cn>,
and was modified to fix problems and to adapt to changes in TCG.

Signed-off-by: Richard Henderson <rth@twiddle.net>
fixup save s5
hack -O1 util/iov.c
fixup comparison array sizes
tcg-alpha: Implement tcg_register_jit
tcg-alpha: Use a register pointing to the start of the TB

A pointer into the local TB may be used for easy near-pc-relative
address generation.  This includes pointers to other TBs or some
pointers to other qemu data structures.  In future it could also
be used for a constant pool.

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