Bump bootstrap compiler to 1.64

[Mark-Simulacrum]

r? @jyn514 perhaps?

[rustbot]

Hey! It looks like you've submitted a new PR for the library teams!

If this PR contains changes to any rust-lang/rust public library APIs then please comment with @rustbot label +T-libs-api -T-libs to tag it appropriately. If this PR contains changes to any unstable APIs please edit the PR description to add a link to the relevant API Change Proposal or create one if you haven't already. If you're unsure where your change falls no worries, just leave it as is and the reviewer will take a look and make a decision to forward on if necessary.

Examples of T-libs-api changes:

• Stabilizing library features
• Introducing insta-stable changes such as new implementations of existing stable traits on existing stable types
• Introducing new or changing existing unstable library APIs (excluding permanently unstable features / features without a tracking issue)
• Changing public documentation in ways that create new stability guarantees
• Changing observable runtime behavior of library APIs

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

[jyn514]

r=me when CI passes

[Mark-Simulacrum]

@bors r=jyn514 rollup=iffy

[bors]

📌 Commit fc0e4ee40de71ec646433592e089afaa2a47b361 has been approved by jyn514

It is now in the queue for this repository.

[bors]

☔ The latest upstream changes (presumably #100456) made this pull request unmergeable. Please resolve the merge conflicts.

[jyn514]

@bors p=20 (should land before rollups)

[Mark-Simulacrum]

@bors r=jyn514 rollup=iffy

[bors]

📌 Commit 1c40ef7 has been approved by jyn514

It is now in the queue for this repository.

[bors]

⌛ Testing commit 1c40ef7 with merge 46c59bb...

[bors]

☀️ Test successful - checks-actions
Approved by: jyn514
Pushing 46c59bb to master...

[rust-timer]

Finished benchmarking commit (46c59bb): comparison url.

Instruction count

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

Max RSS (memory usage)

Results

• Primary benchmarks: mixed results
• Secondary benchmarks: ❌ relevant regressions found

	mean1	max	count2
Regressions ❌ (primary)	2.6%	3.1%	2
Regressions ❌ (secondary)	2.5%	3.3%	5
Improvements ✅ (primary)	-3.5%	-4.7%	2
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-0.5%	-4.7%	4

Cycles

Results

• Primary benchmarks: mixed results
• Secondary benchmarks: no relevant changes found

	mean1	max	count2
Regressions ❌ (primary)	2.2%	2.2%	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-2.3%	-2.3%	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-0.1%	-2.3%	2

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

@rustbot label: -perf-regression

Footnotes

1. the arithmetic mean of the percent change ↩ ↩²

2. number of relevant changes ↩ ↩²