Add track_caller to transmute_copy

[elichai]

Currently if size_of::<Src>() < size_of::<Dst>() you will see the following error:

thread 'test' panicked at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/core/src/mem/mod.rs:1056:5:
cannot transmute_copy if Dst is larger than Src                                                                               

This fixes it so it will show the invocation location

[rustbot]

r? @cuviper

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[cuviper]

Sounds good!

@bors r+

[bors]

📌 Commit 5e49a41 has been approved by cuviper

It is now in the queue for this repository.

[RalfJung]

This could have perf impact.
@bors rollup=never

[bors]

⌛ Testing commit 5e49a41 with merge 4911224...

[bors]

☀️ Test successful - checks-actions
Approved by: cuviper
Pushing 4911224 to master...

[rust-timer]

Finished benchmarking commit (4911224): comparison URL.

Overall result: ❌ regressions - ACTION NEEDED

Next Steps: If you can justify the regressions found in this perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please open an issue or create a new PR that fixes the regressions, add a comment linking to the newly created issue or PR, and then add the perf-regression-triaged label to this PR.

@rustbot label: +perf-regression
cc @rust-lang/wg-compiler-performance

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)	0.4%	[0.4%, 0.4%]	3
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.4%	[0.4%, 0.4%]	3

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)	-	-	0
Improvements ✅ (primary)	-1.5%	[-1.5%, -1.5%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-1.5%	[-1.5%, -1.5%]	1

Cycles

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

Binary size

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

Bootstrap: 637.374s -> 635.971s (-0.22%)
Artifact size: 304.45 MiB -> 304.52 MiB (0.02%)

[pnkfelix]

• regressed bitmaps incr-full for check (0.37%), opt (0.36%), and debug (0.36%).
• this seems likely to be noise. It certainly paled in comparison to the regression associated with Add all RPITITs when augmenting param-env with GAT bounds in check_type_bounds #117131 for this benchmark.
• marking as triaged.

@rustbot label: +perf-regression-triaged