Use addr_eq in {Arc,Rc}::ptr_eq

[scottmcm]

Since it's made for stuff like this (see #106447)

[rustbot]

r? @joshtriplett

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[workingjubilee]

seems good to me.
@bors r+

[bors]

📌 Commit f8fc0d7 has been approved by workingjubilee

It is now in the queue for this repository.

[bors]

⌛ Testing commit f8fc0d7 with merge 79f38b7...

[bors]

☀️ Test successful - checks-actions
Approved by: workingjubilee
Pushing 79f38b7 to master...

[rust-timer]

Finished benchmarking commit (79f38b7): 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

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)	5.5%	[5.5%, 5.5%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-5.7%	[-5.7%, -5.7%]	1
Improvements ✅ (secondary)	-3.4%	[-3.4%, -3.4%]	1
All ❌✅ (primary)	-0.1%	[-5.7%, 5.5%]	2

Cycles

Results

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)	3.6%	[2.3%, 5.8%]	6
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

Results

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)	0.1%	[0.1%, 0.1%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.2%	[-0.3%, -0.1%]	2
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-0.1%	[-0.3%, 0.1%]	3

Bootstrap: 622.162s -> 622.655s (0.08%)
Artifact size: 272.03 MiB -> 272.02 MiB (-0.00%)