fix range[enum] type conversion (#13204) [backport]

tests/range/tenums.nim

@@ -0,0 +1,33 @@
+discard """
+  cmd: "nim check --hints:off $file"
+  errormsg: "type mismatch: got <BC>"
+  nimout: '''
+tenums.nim(32, 20) Error: type mismatch: got <Letters>
+but expected one of:
+proc takesChristmasColor(color: ChristmasColors)
+  first type mismatch at position: 1
+  required type for color: ChristmasColors
+  but expression 'A' is of type: Letters
+
+expression: takesChristmasColor(A)
+tenums.nim(33, 20) Error: type mismatch: got <BC>
+but expected one of:
+proc takesChristmasColor(color: ChristmasColors)
+  first type mismatch at position: 1
+  required type for color: ChristmasColors
+  but expression 'BC(C)' is of type: BC
+
+expression: takesChristmasColor(BC(C))
+'''
+"""
+
+type
+  Colors = enum Red, Green, Blue
+  ChristmasColors = range[Red .. Green]
+  Letters = enum A, B, C
+  BC = range[B .. C]
+
+proc takesChristmasColor(color: ChristmasColors) = discard
+takesChristmasColor(Green)
+takesChristmasColor(A)
+takesChristmasColor(BC(C))