miri libstd tests: test windows-msvc instead of windows-gnu

[RalfJung]

This avoids #123583. MSVC is the more widely used target anyway AFAIK, so probably makes more sense to cover that.

[rustbot]

r? @onur-ozkan

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[onur-ozkan]

@bors r+

[bors]

📌 Commit 8d5c47f has been approved by onur-ozkan

It is now in the queue for this repository.

[RalfJung]

@bors p=1
fixes CI failures in unrelated PRs

[bors]

⌛ Testing commit 8d5c47f with merge 25087e0...

[bors]

☀️ Test successful - checks-actions
Approved by: onur-ozkan
Pushing 25087e0 to master...

[rust-timer]

Finished benchmarking commit (25087e0): comparison URL.

Overall result: ❌ regressions - no action needed

@rustbot label: -perf-regression

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
Regressions ❌ (secondary)	0.7%	[0.7%, 0.7%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

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)	-3.9%	[-3.9%, -3.9%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-3.9%	[-3.9%, -3.9%]	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: 670.936s -> 672.766s (0.27%)
Artifact size: 315.45 MiB -> 315.42 MiB (-0.01%)