tcg: Add TCG_COND_NEVER, TCG_COND_ALWAYS

There are several cases that can be handled easier inside both
translators and code generators if we have out-of-band values
for conditions.  It's easy enough to handle ALWAYS and NEVER in
the natural way inside the tcg middle-end.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c
index bb2306d..4952c05 100644
--- a/tcg/i386/tcg-target.c
+++ b/tcg/i386/tcg-target.c
@@ -338,7 +338,7 @@
 #define JCC_JLE 0xe
 #define JCC_JG  0xf
 
-static const uint8_t tcg_cond_to_jcc[10] = {
+static const uint8_t tcg_cond_to_jcc[] = {
     [TCG_COND_EQ] = JCC_JE,
     [TCG_COND_NE] = JCC_JNE,
     [TCG_COND_LT] = JCC_JL,