re-add git-commit-hash file to tarballs

[dawnofmidnight]

#100557 removed the git-commit-hash file and replaced it with git-commit-info. However, build-manifest relies on the git-commit-hash file being present, so this adds it back.

r? @Mark-Simulacrum

[Mark-Simulacrum]

I think there's another place not covered by this https://github.com/rust-lang/rust/pull/100557/files#diff-2f4b08d54e680939ebd8445ceb0f27755c515e62607519819ce4caa6fc74caa6L300 in tarball.rs. Can you check?

[dawnofmidnight]

Hm, yeah you're right. When I tested with x dist rustc-src the file was generated, but I'm not entirely sure of the details of what tarball.rs does.

I can go ahead and fix that, though. I'll factor it out into a free function like the previous PR did to git-commit-info.

[Mark-Simulacrum]

@bors r+ p=10

[bors]

📌 Commit 5c908c6 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

[bors]

⌛ Testing commit 5c908c6 with merge 33d3519...

[bors]

☀️ Test successful - checks-actions
Approved by: Mark-Simulacrum
Pushing 33d3519 to master...

[rust-timer]

Finished benchmarking commit (33d3519): 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)	1.8%	[1.8%, 1.8%]	1
Regressions ❌ (secondary)	9.9%	[9.9%, 9.9%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-4.7%	[-5.0%, -4.5%]	2
All ❌✅ (primary)	1.8%	[1.8%, 1.8%]	1

Cycles

This benchmark run did not return any relevant results for this metric.

Footnotes

1. the arithmetic mean of the percent change ↩

2. number of relevant changes ↩