[proposal][FMV] Make target_clones and target_version mixable

[DanielKristofKiss]

as proposed https://github.com/llvm/llvm-project/pull/74358#discussion_r1462172419 here let's make possible to mix target_clones with target_version.

__attribute__((target_clones("dotprod", "aes"))) 
int callee(void) {
    return 42;
}

__attribute__((target_version("default"))) 
int callee(void) {
    return 0;
}

int caller(void) {
    return callee();
}

[vhscampos]

Hi, thanks for your issue report.

If possible, we encourage you to contribute with a Pull Request that addresses this issue. We will be happy to review it.

[labrinea]

I have created https://github.com/ARM-software/acle/pull/310 for this.