Return error code from x.ps1

[ChrisDenton]

Fixes#111136

This works around a bug where ExitCode does not return the exit code. See: https://stackoverflow.com/a/23797762

[rustbot]

r? @Mark-Simulacrum

(rustbot has picked a reviewer for you, use r? to override)

[ChrisDenton]

I also added at check that we can get the exit code. So if it does return null again, it'll be a hard error.

[jyn514]

@bors r+ rollup p=1

[bors]

📌 Commit 9ea7142 has been approved by jyn514

It is now in the queue for this repository.

[bors]

⌛ Testing commit 9ea7142 with merge f557a4f...

[bors]

☀️ Test successful - checks-actions
Approved by: jyn514
Pushing f557a4f to master...

[rust-timer]

Finished benchmarking commit (f557a4f): 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)	3.2%	[3.2%, 3.2%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.3%	[-2.3%, -2.3%]	1
All ❌✅ (primary)	3.2%	[3.2%, 3.2%]	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: 654.067s -> 655.771s (0.26%)