- Change typedef and const enums to not convert from literals by default. (#2934)

- Add `@constinit` to allow old typedef behaviour.

test/test_suite/distinct/test_ops_on_int.c3

@@ -1,6 +1,6 @@
 module test;
 
-typedef Foo = int;
+typedef Foo @constinit = int;
 
 fn int test1()
 {

test/test_suite/enumerations/enum_const.c3t

@@ -24,7 +24,7 @@ const enum Bde2 :  int
 	BAR = 100
 }
 
-typedef Bde3 = int;
+typedef Bde3 @constinit = int;
 const BDE3_FOO = 2;
 const BDE3_BAR = 100;