fix rtti sizeof for varargs in global scope (#13125) [backport]

(cherry picked from commit bf2e052e6d)

compiler/ast.nim

@@ -536,6 +536,7 @@ type
     tfContravariant   # contravariant generic param
     tfCheckedForDestructor # type was checked for having a destructor.
                            # If it has one, t.destructor is not nil.
+    tfIncompleteStruct # treat this type as if it had sizeof(pointer)
 
   TTypeFlags* = set[TTypeFlag]
 
@@ -577,7 +578,6 @@ type
 const
   routineKinds* = {skProc, skFunc, skMethod, skIterator,
                    skConverter, skMacro, skTemplate}
-  tfIncompleteStruct* = tfVarargs
   tfUnion* = tfNoSideEffect
   tfGcSafe* = tfThread
   tfObjHasKids* = tfEnumHasHoles

tests/assign/tassign.nim

@@ -5,6 +5,7 @@ TEMP=C:\Programs\xyz\bin
 8 5 0 0
 pre test a:test b:1 c:2 haha:3
 assignment test a:test b:1 c:2 haha:3
+abc123
 '''
 """
 
@@ -207,3 +208,11 @@ when false:
     var
       a, b: Foo
     a = b
+
+block tgeneric_assign_varargs:
+  template fatal(msgs: varargs[string]) =
+    for msg in msgs:
+      stdout.write(msg)
+    stdout.write('\n')
+
+  fatal "abc", "123"