macros: Extend treeTraverse intVal range to nnkUInt64Lit (#21597)

* Extend intVal range to nnkUInt64Lit

Fixes #21593

* Properly cast intVal as unsigned

* Add testcase for #21593

lib/core/macros.nim

@@ -947,6 +947,8 @@ proc treeTraverse(n: NimNode; res: var string; level = 0; isLisp = false, indent
     discard # same as nil node in this representation
   of nnkCharLit .. nnkInt64Lit:
     res.add(" " & $n.intVal)
+  of nnkUIntLit .. nnkUInt64Lit:
+    res.add(" " & $cast[uint64](n.intVal))
   of nnkFloatLit .. nnkFloat64Lit:
     res.add(" " & $n.floatVal)
   of nnkStrLit .. nnkTripleStrLit, nnkCommentStmt, nnkIdent, nnkSym:

tests/macros/t21593.nim

@@ -0,0 +1,13 @@
+discard """
+nimout: '''
+StmtList
+  UIntLit 18446744073709551615
+  IntLit -1'''
+"""
+
+import macros
+
+dumpTree:
+  0xFFFFFFFF_FFFFFFFF'u
+  0xFFFFFFFF_FFFFFFFF
+