Allow generators to impl Clone/Copy

[crlf0710]

Revives #95137. It's a pity that the original pr didn't land because the implementation is almost complete! All credits goes to @canndrew, and i just resolved the merge conflicts and updated the feature gate version number.

r? @oli-obk

[rustbot]

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

[crlf0710]

cc #95360

[oli-obk]

@bors r+

[bors]

📌 Commit 4e9bcb5 has been approved by oli-obk

It is now in the queue for this repository.

[bors]

⌛ Testing commit 4e9bcb5 with merge 6f0c4a6...

[bors]

☀️ Test successful - checks-actions
Approved by: oli-obk
Pushing 6f0c4a6 to master...

[rust-timer]

Finished benchmarking commit (6f0c4a6): 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.

	mean1	range	count2
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	1.4%	[0.9%, 2.2%]	4
Improvements ✅ (primary)	-3.4%	[-3.4%, -3.4%]	1
Improvements ✅ (secondary)	-1.1%	[-1.2%, -0.8%]	4
All ❌✅ (primary)	-3.4%	[-3.4%, -3.4%]	1

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.

	mean1	range	count2
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-6.9%	[-6.9%, -6.9%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-6.9%	[-6.9%, -6.9%]	1

Footnotes

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

2. number of relevant changes↩↩²

[canndrew]

Ah, thanks tons @crlf0710 for picking this back up. I've been hella busy lately and let if fall by the wayside. Glad to see it made it in :)