[Bug tree-optimization/128312] Return slot optimization makes a throwing call's partial result visible in the caller's catch handler

[lzy20000419 at outlook dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128312

--- Comment #4 from liu zhenyu <lzy20000419 at outlook dot com> ---
Created attachment 66044
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=66044&action=edit
conservative fix, tested on 14.2