Revert "Suggest x build library for a custom toolchain that fails to load core"

[Noratrieb]

This reverts commit b913f55.

CI builds with profile=nightly, causing different test output.

Making the output depend on the release channel was not a great idea and we have to be more careful with this.

I did not realize that the change could have such effects on test output but it's kinda obvious with hindsight >.<.

[rustbot]

r? @cjgillot

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[Noratrieb]

@bors r=10

[bors]

📌 Commit 9aad59bf61193af23642d4da1117e647fd8d6e76 has been approved by 10

It is now in the queue for this repository.

[Noratrieb]

@bors r-
@bors p=10

[oli-obk]

@bors r+

[bors]

📌 Commit 9aad59bf61193af23642d4da1117e647fd8d6e76 has been approved by oli-obk

It is now in the queue for this repository.

[Noratrieb]

@bors r=oli-obk

[bors]

📌 Commit ba0f5dc has been approved by oli-obk

It is now in the queue for this repository.

[bors]

⌛ Testing commit ba0f5dc with merge 3ae0ef7...

[bors]

☀️ Test successful - checks-actions
Approved by: oli-obk
Pushing 3ae0ef7 to master...

[rust-timer]

Finished benchmarking commit (3ae0ef7): comparison URL.

Overall result: ✅ improvements - 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
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-1.1%	[-1.2%, -1.0%]	6
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

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

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: 668.125s -> 670.578s (0.37%)