Restore the Nim's 0.14 proper handling of generic aliases

A more efficient implementation is possible by restoring the old
lifting ot tyGenericInvocation to tyGenericInst in liftTypeParam,
but this fix will suffice for now.

fixes #5087
fixes #5602
fixes #5641
fixes #5570

tests/generics/tparam_binding.nim

@@ -0,0 +1,28 @@
+discard """
+  errormsg: "got (ref Matrix[2, 2, system.float], ref Matrix[2, 1, system.float])"
+  line: 27
+"""
+
+type
+  Matrix[M,N: static[int]; T: SomeReal] = distinct array[0..(M*N - 1), T]
+
+let a = new Matrix[2,2,float]
+let b = new Matrix[2,1,float]
+
+proc foo[M,N: static[int],T](a: ref Matrix[M, N, T], b: ref Matrix[M, N, T])=
+  discard
+
+foo(a, a)
+
+proc bar[M,N: static[int],T](a: ref Matrix[M, M, T], b: ref Matrix[M, N, T])=
+  discard
+
+bar(a, b)
+bar(a, a)
+
+proc baz[M,N: static[int],T](a: ref Matrix[N, N, T], b: ref Matrix[M, N, T])=
+  discard
+
+baz(a, a)
+baz(a, b)
+