[Bug target/71709] powerpc64le: argument to strcpy() optimised out

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71709

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC must be thinking saved_command_line and static_command_line are the same
...

Because strcpy returns the 1st argument.