[Bug tree-optimization/84824] DCE fails to remove dead code of std::function constructor

[manjian2006 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84824

--- Comment #16 from linzj <manjian2006 at gmail dot com> ---
Created attachment 43783
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43783&action=edit
This patch trying simulate a local escaped node for function call.

This patch trying simulate a local escaped node for function call. Thus all
function call get the correct clobber/use set.