[Bug target/82641] Unable to enable crc32 for a certain function with target attribute on ARM

[yyc1992 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82641

--- Comment #1 from Yichao Yu <yyc1992 at gmail dot com> ---
I've found a workaround in
https://sourceware.org/ml/binutils/2017-04/msg00171.html but it's extremely
ugly (albeit also very clever...).