math.big constants were no longer initialized

Fixes #3243

core/math/big/helpers.odin

@@ -777,6 +777,11 @@ int_from_bytes_little_python :: proc(a: ^Int, buf: []u8, signed := false, alloca
 */
 INT_ONE, INT_ZERO, INT_MINUS_ONE, INT_INF, INT_MINUS_INF, INT_NAN := &Int{}, &Int{}, &Int{}, &Int{}, &Int{}, &Int{}
 
+@(init, private)
+_init_constants :: proc() {
+	initialize_constants()
+}
+
 initialize_constants :: proc() -> (res: int) {
 	internal_set(     INT_ZERO,  0);      INT_ZERO.flags = {.Immutable}
 	internal_set(      INT_ONE,  1);       INT_ONE.flags = {.Immutable}
@@ -788,7 +793,7 @@ initialize_constants :: proc() -> (res: int) {
 	*/
 	internal_set(      INT_NAN,  1);       INT_NAN.flags = {.Immutable, .NaN}
 	internal_set(      INT_INF,  1);       INT_INF.flags = {.Immutable, .Inf}
-	internal_set(      INT_INF, -1); INT_MINUS_INF.flags = {.Immutable, .Inf}
+	internal_set(INT_MINUS_INF, -1); INT_MINUS_INF.flags = {.Immutable, .Inf}
 
 	return _DEFAULT_MUL_KARATSUBA_CUTOFF
 }