ffi_unwind_calls: treat RustIntrinsic like regular Rust calls

[RalfJung]

Also add some comments to abi_can_unwind to explain what happens.

r? @nbdd0121 Cc @BatmanAoD

[rustbot]

Failed to set assignee to nbdd0121: invalid assignee

Note: Only org members with at least the repository "read" role, users with write permissions, or people who have commented on the PR may be assigned.

[rustbot]

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

[RalfJung]

r? @BatmanAoD then maybe?

[rustbot]

Failed to set assignee to BatmanAoD: invalid assignee

Note: Only org members with at least the repository "read" role, users with write permissions, or people who have commented on the PR may be assigned.

[RalfJung]

Ah, sorry, I thought someone must have made you reviewer by now oops.
r? compiler

[BatmanAoD]

Ah, sorry, I thought someone must have made you reviewer by now oops.

I don't actually know very much at all about rustc internals, and haven't read much of the code.

[davidtwco]

r=me with typo fix

[RalfJung]

@bors r=davidtwco

[bors]

📌 Commit f5c80dc has been approved by davidtwco

It is now in the queue for this repository.

[bors]

⌛ Testing commit f5c80dc with merge b6e4299...

[bors]

☀️ Test successful - checks-actions
Approved by: davidtwco
Pushing b6e4299 to master...

[rust-timer]

Finished benchmarking commit (b6e4299): 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)	-1.7%	[-1.7%, -1.7%]	1
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

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

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

Binary size

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

Bootstrap: 650.65s -> 650.523s (-0.02%)
Artifact size: 311.12 MiB -> 311.11 MiB (-0.00%)