[Bug c/95777] Allow specifying more than one target options at the same time in target and target_clones attribute

[yyc1992 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95777

--- Comment #3 from Yichao Yu <yyc1992 at gmail dot com> ---
And for backward compatibility maybe
`target_clones("(sse4.1,arch=core2),default")` would work?