Remove the workaround for llvm.17868?

[Chandlerooo]

I notice there seems to be a workaround for llvm.17868 in line 1453 of ssa.c :
https://github.com/mono/mono/blob/main/mono/mini/ssa.c

/*
	* h->nesting is needed to work around:
	* http://llvm.org/bugs/show_bug.cgi?id=17868
	*/
if (!(idom && idom->last_ins && idom->last_ins->opcode == OP_BR && idom->last_ins->inst_target_bb == h && h->nesting == 1)) {
	continue;
}

This compiler bug is already marked as fixed due to can't be reproduced: https://bugs.llvm.org/show_bug.cgi?id=17868
Shall te above workaround be removed? Does this bug still exist?