Enable incremental-relative-spans by default.

[cjgillot]

This was enabled on nightly in #84762.

It has been a while, without obvious bugs. It's time to enable it by default for incremental runs.

[rustbot]

r? @davidtwco

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[davidtwco]

This seems reasonable to me, we've waited since Jan (~9mths), I don't see any bugs having been bisected to that PR (with the exception of #106571, which should be addressed but is quite minor), it had a FCP in that PR, and there are good incremental performance wins to be had from this.

[davidtwco]

@bors r+ rollup=never

[bors]

📌 Commit 717dc1c has been approved by davidtwco

It is now in the queue for this repository.

[bors]

⌛ Testing commit 717dc1c with merge 55e5c9d...

[bors]

☀️ Test successful - checks-actions
Approved by: davidtwco
Pushing 55e5c9d to master...

[rust-timer]

Finished benchmarking commit (55e5c9d): comparison URL.

Overall result: ✅ improvements - no action needed

@rustbot label: -perf-regression

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-1.5%	[-1.5%, -1.5%]	1
All ❌✅ (primary)	-	-	0

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)	-	-	0
Regressions ❌ (secondary)	1.6%	[0.8%, 2.4%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.9%	[-0.9%, -0.9%]	1
All ❌✅ (primary)	-	-	0

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)	3.3%	[2.3%, 3.9%]	6
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

Bootstrap: 629.427s -> 629.551s (0.02%)
Artifact size: 317.62 MiB -> 317.53 MiB (-0.03%)