Import std/stackframes in ast2ir.nim (#22815)

Ref https://github.com/nim-lang/Nim/pull/22777#issuecomment-1758090410

Co-authored-by: SirOlaf <>

compiler/nir/ast2ir.nim

@@ -17,6 +17,9 @@ import .. / ic / bitabs
 
 import nirtypes, nirinsts, nirlineinfos, nirslots, types2ir
 
+when defined(nimCompilerStacktraceHints):
+  import std/stackframes
+
 type
   ModuleCon* = ref object
     strings*: BiTable[string]