fixed dot operator recursive loop & macro suggest (#16922)

* basic stability improvements; refs nimsuggest
* fixed dot operator recursive loop & macro suggest
* hacky fix for run away dot operator sem check

Committing this mostly to make the issue more clear. Perhaps get better
feedback.

* semExprWithType seems like a better place to check
* fixed error messages const case expressions
* Clean-up test
* stopped the dot operator madness

No longer get infinite recursion when seming broken code with a dot
operator macro like in jsffi.

Co-authored-by: Araq <rumpf_a@web.de>

tests/js/t11166.nim

@@ -1,4 +1,20 @@
+discard """
+  output: '''
+test1
+test2
+'''
+"""
+
 import jsffi
 
+type
+  C = object
+    props: int
+
+var c: C
+
 when compiles(c.props):
-  echo "test"
+  echo "test1"
+
+when not compiles(d.props):
+  echo "test2"