Commit cf45d77

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Add test to self-check needs-target-has-atomic directive

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	`1`	`+// Check this ignored because x86_64-unknown-linux-gnu does not have 128-bit atomic operation.`
	`2`	`+`
	`3`	`+//@ only-x86_64-unknown-linux-gnu`
	`4`	`+//@ needs-target-has-atomic: 128`
	`5`	`+`
	`6`	`+fn main() {`
	`7`	`+ #[cfg(not(target_has_atomic = "128"))]`
	`8`	`+ compile_error!("target does not have 128-bit atomic operation");`
	`9`	`+}`

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