don't crash when can't evaluate comptime expression with inferred type

Closes #15911.

src/Module.zig

@@ -6021,6 +6021,10 @@ pub fn errNoteNonLazy(
     comptime format: []const u8,
     args: anytype,
 ) error{OutOfMemory}!void {
+    if (src_loc.lazy == .unneeded) {
+        assert(parent.src_loc.lazy == .unneeded);
+        return;
+    }
     const msg = try std.fmt.allocPrint(mod.gpa, format, args);
     errdefer mod.gpa.free(msg);