Correct lineinfo for accent quoted symbols in proc definition (#10399)

* compiler/parser: preserve lineinfo for accent quoted symbols

Previously the lineinfo for symbol $$$ in this example is:

    proc `$$$`
             ^

After this commit:

    proc `$$$`
          ^

* compiler/semstmts: correct lineinfo for accent quoted idents

Previously nimsuggest would highlight this as:

    proc `$$$`
         ^~~

After this commit:

    proc `$$$`
          ^~~

* nimsuggest/tests: add a test for accent quoted proc

Disabled by default

compiler/semstmts.nim

@@ -318,16 +318,16 @@ proc semIdentDef(c: PContext, n: PNode, kind: TSymKind): PSym =
     result = semIdentWithPragma(c, kind, n, {})
     if result.owner.kind == skModule:
       incl(result.flags, sfGlobal)
-  let info = case n.kind
-             of nkPostfix:
-               n.sons[1].info
-             of nkPragmaExpr:
-               if n.sons[0].kind == nkPostfix:
-                 n.sons[0].sons[1].info
-               else:
-                 n.sons[0].info
-             else:
-               n.info
+
+  proc getLineInfo(n: PNode): TLineInfo =
+    case n.kind
+    of nkPostfix:
+      getLineInfo(n.sons[1])
+    of nkAccQuoted, nkPragmaExpr:
+      getLineInfo(n.sons[0])
+    else:
+      n.info
+  let info = getLineInfo(n)
   suggestSym(c.config, info, result, c.graph.usageSym)
 
 proc checkNilable(c: PContext; v: PSym) =