Remove some wasm/emscripten ignores

[saethlin]

I'm planning on landing a few PRs like this that remove ignores that aren't required. This just covers mir-opt and codegen tests.

[rustbot]

r? @Mark-Simulacrum

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[Mark-Simulacrum]

@bors r+

[bors]

📌 Commit b678d40 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

[bors]

⌛ Testing commit b678d40 with merge 668bf8c...

[bors]

☀️ Test successful - checks-actions
Approved by: Mark-Simulacrum
Pushing 668bf8c to master...

[rust-timer]

Finished benchmarking commit (668bf8c): 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)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-2.4%	[-2.6%, -2.2%]	2
Improvements ✅ (secondary)	-1.6%	[-2.4%, -1.1%]	3
All ❌✅ (primary)	-2.4%	[-2.6%, -2.2%]	2

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: 631.815s -> 631.179s (-0.10%)
Artifact size: 316.06 MiB -> 315.90 MiB (-0.05%)