rustc_target: Add pauth-lr aarch64 target feature

[mrkajetanp]

Add the pauth-lr target feature, corresponding to aarch64 FEAT_PAuth_LR. This feature has been added in LLVM 19.
It is currently not supported by the Linux hwcap and so we cannot add runtime feature detection for it at this time.

r? @Amanieu

[rustbot]

Some changes occurred in tests/ui/check-cfg

cc @Urgau

[Amanieu]

@bors r+

[bors]

📌 Commit f641c32 has been approved by Amanieu

It is now in the queue for this repository.

[bors]

⌛ Testing commit f641c32 with merge f7cf41c...

[bors]

☀️ Test successful - checks-actions
Approved by: Amanieu
Pushing f7cf41c to master...

[rust-timer]

Finished benchmarking commit (f7cf41c): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results (primary -2.8%, secondary 5.3%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	5.3%	[5.3%, 5.3%]	2
Improvements ✅ (primary)	-2.8%	[-2.8%, -2.8%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-2.8%	[-2.8%, -2.8%]	1

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 783.245s -> 782.934s (-0.04%)
Artifact size: 333.70 MiB -> 333.73 MiB (0.01%)