Similar to Arm, this adds an unconditional speculation barrier for AArch64.

	* config/aarch64.md (unspecv): Add UNSPECV_SPECULAION_BARRIER.
	(speculation_barrier): New insn.
---
 gcc/config/aarch64/aarch64.md | 10 ++++++++++
 1 file changed, 10 insertions(+)