tcg: Constify tcg_op_defs

Now that we're no longer assigning to TCGOpDef.args_ct,
we can make the array constant.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/tcg/tcg.h

@@ -716,7 +716,7 @@ typedef struct TCGOpDef {
     uint8_t flags;
 } TCGOpDef;
 
-extern TCGOpDef tcg_op_defs[];
+extern const TCGOpDef tcg_op_defs[];
 extern const size_t tcg_op_defs_max;
 
 /*

tcg/tcg-common.c

@@ -26,7 +26,7 @@
 #include "tcg/tcg.h"
 #include "tcg-has.h"
 
-TCGOpDef tcg_op_defs[] = {
+const TCGOpDef tcg_op_defs[] = {
 #define DEF(s, oargs, iargs, cargs, flags) \
          { #s, oargs, iargs, cargs, iargs + oargs + cargs, flags },
 #include "tcg/tcg-opc.h"

tcg/tcg.c

@@ -3364,7 +3364,7 @@ static void process_constraint_sets(void)
 
 static const TCGArgConstraint *opcode_args_ct(const TCGOp *op)
 {
-    TCGOpDef *def = &tcg_op_defs[op->opc];
+    const TCGOpDef *def = &tcg_op_defs[op->opc];
     TCGConstraintSetIndex con_set;
 
     if (def->nb_iargs + def->nb_oargs == 0) {