Allow `int` size combinations for `MRB_WORD_BOXING`.

- `MRB_64BIT` and `MRB_INT32`
- `MRB_32BIT` and `MRB_INT64`

include/mruby/boxing_word.h

@@ -7,10 +7,6 @@
 #ifndef MRUBY_BOXING_WORD_H
 #define MRUBY_BOXING_WORD_H
 
-#if defined(MRB_INT64) && !defined(MRB_64BIT)
-#error MRB_INT64 cannot be used with MRB_WORD_BOXING in 32-bit mode.
-#endif
-
 #ifndef MRB_NO_FLOAT
 struct RFloat {
   MRB_OBJECT_HEADER;

include/mruby/irep.h

@@ -31,7 +31,7 @@ typedef struct mrb_pool_value {
   union {
     const char *str;
     int32_t i32;
-#ifdef MRB_64BIT
+#if defined(MRB_64BIT) || defined(MRB_INT64)
     int64_t i64;
 #endif
     mrb_float f;

include/mruby/value.h

@@ -56,8 +56,6 @@ struct mrb_state;
 # define MRB_INT_BIT 64
 # define MRB_INT_MIN INT64_MIN
 # define MRB_INT_MAX INT64_MAX
-# define MRB_FIXNUM_MIN (INT64_MIN>>MRB_FIXNUM_SHIFT)
-# define MRB_FIXNUM_MAX (INT64_MAX>>MRB_FIXNUM_SHIFT)
 # define MRB_PRIo PRIo64
 # define MRB_PRId PRId64
 # define MRB_PRIx PRIx64
@@ -66,13 +64,19 @@ struct mrb_state;
 # define MRB_INT_BIT 32
 # define MRB_INT_MIN INT32_MIN
 # define MRB_INT_MAX INT32_MAX
-# define MRB_FIXNUM_MIN (INT32_MIN>>MRB_FIXNUM_SHIFT)
-# define MRB_FIXNUM_MAX (INT32_MAX>>MRB_FIXNUM_SHIFT)
 # define MRB_PRIo PRIo32
 # define MRB_PRId PRId32
 # define MRB_PRIx PRIx32
 #endif
 
+#if defined(MRB_64BIT) && defined(MRB_INT64)
+# define MRB_FIXNUM_MIN (INT64_MIN>>MRB_FIXNUM_SHIFT)
+# define MRB_FIXNUM_MAX (INT64_MAX>>MRB_FIXNUM_SHIFT)
+#else
+# define MRB_FIXNUM_MIN (INT32_MIN>>MRB_FIXNUM_SHIFT)
+# define MRB_FIXNUM_MAX (INT32_MAX>>MRB_FIXNUM_SHIFT)
+#endif
+
 #ifdef MRB_ENDIAN_BIG
 # define MRB_ENDIAN_LOHI(a,b) a b
 #else