target/xtensa: make opcode properties more dynamic

There's XtensaOpcodeOps::test_ill that is used to check whether opcode
generates illegal opcode exception or not. The illegal opcode exception
is not special and so this callback can be generalized to provide any
XTENSA_OP_* flags that are not completely static.
Introduce XtensaOpcodeOps::test_exceptions and convert all test_ill
users to test_exceptions.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

target/xtensa/cpu.h

@@ -364,9 +364,6 @@ typedef struct opcode_arg {
 typedef struct DisasContext DisasContext;
 typedef void (*XtensaOpcodeOp)(DisasContext *dc, const OpcodeArg arg[],
                                const uint32_t par[]);
-typedef bool (*XtensaOpcodeBoolTest)(DisasContext *dc,
-                                     const OpcodeArg arg[],
-                                     const uint32_t par[]);
 typedef uint32_t (*XtensaOpcodeUintTest)(DisasContext *dc,
                                          const OpcodeArg arg[],
                                          const uint32_t par[]);
@@ -408,7 +405,7 @@ enum {
 typedef struct XtensaOpcodeOps {
     const void *name;
     XtensaOpcodeOp translate;
-    XtensaOpcodeBoolTest test_ill;
+    XtensaOpcodeUintTest test_exceptions;
     XtensaOpcodeUintTest test_overflow;
     const uint32_t *par;
     uint32_t op_flags;