target/i386: Reduce DisasContext.override to int8_t

The range of values is -1 (none) to 5 (R_GS).

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210514151342.384376-22-richard.henderson@linaro.org>

target/i386/tcg/translate.c

@@ -77,7 +77,7 @@ typedef struct DisasContext {
     DisasContextBase base;
 
     /* current insn context */
-    int override; /* -1 if no override */
+    int8_t override; /* -1 if no override, else R_CS, R_DS, etc */
     int prefix;
     MemOp aflag;
     MemOp dflag;