Extract a create_wrapper_function for use in allocator shim writing

[bjorn3]

This deduplicates some logic and makes it easier to follow what wrappers are produced. In the future it may allow moving the code to determine which wrappers to create to cg_ssa.

[rustbot]

r? @jackh726

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[bors]

☔ The latest upstream changes (presumably #105545) made this pull request unmergeable. Please resolve the merge conflicts.

[jackh726]

@bors r+ rollup

[bors]

📌 Commit 49ae3b7 has been approved by jackh726

It is now in the queue for this repository.

[bors]

⌛ Testing commit 49ae3b7 with merge 644e806...

[bors]

☀️ Test successful - checks-actions
Approved by: jackh726
Pushing 644e806 to master...

[bors]

☀️ Test successful - checks-actions
Approved by: jackh726
Pushing 644e806 to master...

[rust-timer]

Finished benchmarking commit (644e806): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

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

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)	2.4%	[2.0%, 2.8%]	2
Regressions ❌ (secondary)	3.0%	[2.6%, 3.4%]	2
Improvements ✅ (primary)	-4.3%	[-4.3%, -4.3%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.2%	[-4.3%, 2.8%]	3

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: 633.947s -> 632.481s (-0.23%)