activated tests for tr macros

tests/patterns/tnoalias.nim

@@ -0,0 +1,16 @@
+discard """
+  output: "23"
+"""
+
+template optslice{a = b + c}(a: expr{noalias}, b, c: expr): stmt =
+  a = b
+  inc a, c
+
+var
+  x = 12
+  y = 10
+  z = 13
+
+x = y+z
+
+echo x