Update LLVM submodule

[nikic]

Merge upstream release/15.x branch.

Fixes #102738.

[rust-highfive]

r? @cuviper

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[rust-highfive]

⚠️ Warning ⚠️

• These commits modify submodules.

[cuviper]

@bors r+ rollup=never

[bors]

📌 Commit 3f19fa4 has been approved by cuviper

It is now in the queue for this repository.

[bors]

⌛ Testing commit 3f19fa4 with merge 77e57db...

[bors]

☀️ Test successful - checks-actions
Approved by: cuviper
Pushing 77e57db to master...

[rust-timer]

Finished benchmarking commit (77e57db): 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)	-1.3%	[-1.4%, -1.2%]	2
Improvements ✅ (secondary)	-3.4%	[-3.9%, -3.1%]	6
All ❌✅ (primary)	-1.3%	[-1.4%, -1.2%]	2

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)	2.6%	[2.6%, 2.6%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Cycles

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

[nikic]

Didn't really expect a compile-time change here. Most likely culprit for the improvements is rust-lang/llvm-project@f3c5289.