Make expandMacro show private fields (#24522)

Was debugging with `--expandMacro` and noticed that private fields
weren't exported.
Passes extra flags to the renderer to make them be shown

(cherry picked from commit f80ce139d5)

compiler/sem.nim

@@ -526,7 +526,9 @@ proc semMacroExpr(c: PContext, n, nOrig: PNode, sym: PSym,
   if efNoSemCheck notin flags:
     result = semAfterMacroCall(c, n, result, sym, flags, expectedType)
   if c.config.macrosToExpand.hasKey(sym.name.s):
-    message(c.config, nOrig.info, hintExpandMacro, renderTree(result))
+    message(c.config, nOrig.info, hintExpandMacro, renderTree(result, {
+      renderNonExportedFields, renderDocComments, renderNoComments
+    }))
   result = wrapInComesFrom(nOrig.info, sym, result)
   popInfoContext(c.config)
 

tests/msgs/texpandmacro.nim

@@ -1,8 +1,11 @@
 discard """
   cmd: "nim c --expandMacro:foo $file"
-  nimout: '''texpandmacro.nim(17, 1) Hint: expanded macro:
+  nimout: '''texpandmacro.nim(20, 1) Hint: expanded macro:
 echo ["injected echo"]
-var x = 4 [ExpandMacro]
+var x = 4
+type
+  Hello = object
+    private: string [ExpandMacro]
 '''
   output: '''injected echo'''
 """
@@ -16,3 +19,6 @@ macro foo(x: untyped): untyped =
 
 foo:
   var x = 4
+  type
+    Hello = object
+      private: string