[Bug target/87369] [9 Regression] Regression on aarch64/copysign-bsl.c since r264264

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87369

--- Comment #1 from Jeffrey A. Law <law at redhat dot com> ---
I wonder if we would be better off having the bfxil pattern reject cases when
just the high bit is on (which are those cases where we'd be able to use a bit
instruction rather than bfxil.