Update to LLVM 20 rc 3

[nikic]

Fixes a compiler-builtins miscompile (see rust-lang/compiler-builtins#760).

[rustbot]

r? @cuviper

rustbot has assigned @cuviper.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

[rustbot]

⚠️ Warning ⚠️

• These commits modify submodules.

[onur-ozkan]

The job mingw-check failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

https://github.com/rust-lang/rust/pull/137594/files#diff-e5255e85d66ab827c6eff26a377f41800be547791e268e7e2a9abf487943cf12 (removal of --first-parent part) is the cause of this failure.

cc @RalfJung

[RalfJung]

Oh that is unfortunate, the presence of --first-parent breaks the logic as well for what is a common case in my workflow. :/ Could you post a comment in #101907 explaining the problem that arises without --first-parent?

[cuviper]

@bors r+ rollup=never

[bors]

📌 Commit 3894725 has been approved by cuviper

It is now in the queue for this repository.

[RalfJung]

@nikic could you rebase? The 2nd commit has already landed independently.
@bors r-

[nikic]

@bors r=cuviper

[bors]

📌 Commit 3a71579 has been approved by cuviper

It is now in the queue for this repository.

[bors]

🌲 The tree is currently closed for pull requests below priority 100. This pull request will be tested once the tree is reopened.

[jieyouxu]

@bors p=5 (encouraging more rollup-nevers to go through before more rollups)

[bors]

⌛ Testing commit 3a71579 with merge f4a216d...

[Kobzol]

Due to the usage of smaller CI runners, jobs that have to rebuild LLVM (such as in this PR) take a very long time. If this times out (the timeout is 6h, so it's likely, given that it's 5h30m now and two jobs are still running), just retry it. It will be faster after retried due to Docker and sccache being primed.

[bors]

☀️ Test successful - checks-actions
Approved by: cuviper
Pushing f4a216d to master...

[rust-timer]

Finished benchmarking commit (f4a216d): 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 8.7%)

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)	8.7%	[8.7%, 8.7%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	8.7%	[8.7%, 8.7%]	1

Cycles

Results (secondary -1.2%)

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)	2.4%	[2.4%, 2.4%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.9%	[-3.1%, -2.8%]	2
All ❌✅ (primary)	-	-	0

Binary size

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

Bootstrap: 774.434s -> 773.437s (-0.13%)
Artifact size: 361.97 MiB -> 361.95 MiB (-0.01%)