Allow dest prop on mir-opt-level=2

[spastorino]

Let's test the performance of making this change, note that mir-opt-level is 2 by default in optimized builds.

r? @oli-obk

[spastorino]

@bors try @rust-timer queue

[rust-timer]

Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

[bors]

⌛ Trying commit 2dab3be69f0ad7c1ca9897642480ea1c81b9949f with merge 78261356a28cc4cbbdc805422e42a2c71719ae95...

[bors]

💔 Test failed - checks-actions

[bors]

☔ The latest upstream changes (presumably #82896) made this pull request unmergeable. Please resolve the merge conflicts.

[spastorino]

@bors try @rust-timer queue

[rust-timer]

Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

[bors]

⌛ Trying commit d4a2c48 with merge 280adcdab341682f9f3323ccf1d30db4eef20844...

[bors]

☀️ Try build successful - checks-actions
Build commit: 280adcdab341682f9f3323ccf1d30db4eef20844 (280adcdab341682f9f3323ccf1d30db4eef20844)

[rust-timer]

Queued 280adcdab341682f9f3323ccf1d30db4eef20844 with parent 8f349be, future comparison URL.

[rust-timer]

Finished benchmarking try commit (280adcdab341682f9f3323ccf1d30db4eef20844): comparison url.

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. Please note that if the perf results are neutral, you should likely undo the rollup=never given below by specifying rollup- to bors.

Importantly, though, if the results of this run are non-neutral do not roll this PR up -- it will mask other regressions or improvements in the roll up.

@bors rollup=never
@rustbot label: +S-waiting-on-review -S-waiting-on-perf

[bjorn3]

The parent commit 8f349be is not benchmarked, nor is it queued to be benchmarked.

[oli-obk]

Here's the diff to another parent commit: https://perf.rust-lang.org/compare.html?start=1d6b0f626aad4ee9f2eaec4d5582f45620ccab80&end=280adcdab341682f9f3323ccf1d30db4eef20844&stat=instructions%3Au

Hopefully representative and doesn't include changes from the immediate parent.

[oli-obk]

Looks all pretty noisy. Maybe rebase and run perf again? But from the looks of it this optimization doesn't actually change anything performance wise.

[tmiasko]

The transformation was disabled in #82684, so the second run was ineffective.

[oli-obk]

Oh... I guess we have to fix dest prop first

[Mark-Simulacrum]

parent commit should now be queued, looks like we missed the GitHub notification.