Fix crash stack trace decoding on macOS (#14335)

Author: HertzDevil

src/exception/call_stack/libunwind.cr

@@ -110,12 +110,14 @@ struct Exception::CallStack
 
   private def self.print_frame_location(repeated_frame)
     {% if flag?(:debug) %}
-      if @@dwarf_loaded &&
-         (name = decode_function_name(repeated_frame.ip.address))
-        file, line, column = Exception::CallStack.decode_line_number(repeated_frame.ip.address)
-        if file && file != "??"
-          Crystal::System.print_error "%s at %s:%d:%d", name, file, line, column
-          return
+      if @@dwarf_loaded
+        pc = CallStack.decode_address(repeated_frame.ip)
+        if name = decode_function_name(pc)
+          file, line, column = Exception::CallStack.decode_line_number(pc)
+          if file && file != "??"
+            Crystal::System.print_error "%s at %s:%d:%d", name, file, line, column
+            return
+          end
         end
       end
     {% end %}