[Bug target/64215] -Os misses an opportunity to merge two ret instructions

[tommy_murphy at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64215

--- Comment #4 from Tommy Murphy <tommy_murphy at hotmail dot com> ---
I meant to say that maybe the target needs to be widened/generalised beyond
just "Target:       x86_64-*-*"? As per my previous comment and link, the same
issue has been observed with RISC-V and this comment also mentions it being
observed with AVR and MIPS64:

https://github.com/riscv-collab/riscv-gnu-toolchain/issues/1048#issuecomment-1091943956