Revert "Rollup merge of #154344 - dianqk:update-llvm, r=nikic"

[Kobzol]

This reverts commit d0fcb41, reversing
changes made to 85ddb8e.

Debugging perf. hit from #154384.

Seems like this PR caused some large perf. regressiosn in #154384 :(

CC @dianqk

[Kobzol]

@bors try @rust-timer queue

[rust-bors]

☀️ Try build successful (CI)
Build commit: 6c20012 (6c2001265a930ef1878c1a5a9575a34044358980, parent: fda6d37bb88ee12fd50fa54d15859f1f91b74f55)

[rust-timer]

Finished benchmarking commit (6c20012): comparison URL.

Overall result: ✅ improvements - no action needed

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

@bors rollup=never
@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-1.3%	[-3.2%, -0.2%]	28
Improvements ✅ (secondary)	-1.2%	[-5.0%, -0.2%]	13
All ❌✅ (primary)	-1.3%	[-3.2%, -0.2%]	28

Max RSS (memory usage)

Results (secondary 7.5%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	7.5%	[7.5%, 7.5%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Cycles

Results (primary -2.3%, secondary -3.7%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-2.3%	[-2.7%, -2.1%]	6
Improvements ✅ (secondary)	-3.7%	[-4.0%, -3.4%]	2
All ❌✅ (primary)	-2.3%	[-2.7%, -2.1%]	6

Binary size

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

Bootstrap: 485.109s -> 484.795s (-0.06%)
Artifact size: 395.05 MiB -> 397.03 MiB (0.50%)

[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

Why was this reviewer chosen?

The reviewer was selected based on:

• Owners of files modified in this PR: @cuviper

[rustbot]

⚠️ Warning ⚠️

• Some commits in this PR modify submodules.

  If this was not intentional, see I changed a submodule on accident in the rustc dev guide.

• There are issue links (such as #123) in the commit messages of the following commits.
  Please move them to the PR description, to avoid spamming the issues with references to the commit, and so this bot can automatically canonicalize them to avoid issues with subtree.

  • e724c4f