add has_enzyme/needs-enzyme to the test infra

[ZuseZ4]

This unblocks merging the Enzyme / Autodiff frontend.
For the full implementation, see: #129175

We don't want to run tests that require Enzyme / Autodiff support when we build rustc without the required features.

It correctly filtered out a test which started with //@ needs-enzyme.

running 80 tests i............................................................................... test result: ok. 79 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 380.41ms 

Tracking:

• Tracking Issue for autodiff #124509

r? jieyouxu

[rustbot]

Some changes occurred in src/tools/compiletest

cc @jieyouxu

[jieyouxu]

Thanks, this looks good to me.

[jieyouxu]

@bors r+ rollup

[bors]

📌 Commit bc2a913 has been approved by jieyouxu

It is now in the queue for this repository.

[bors]

⌛ Testing commit bc2a913 with merge b529e27...

[bors]

☀️ Test successful - checks-actions
Approved by: jieyouxu
Pushing b529e27 to master...

[rust-timer]

Finished benchmarking commit (b529e27): 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)	2.0%	[2.0%, 2.0%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (primary 7.8%)

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)	7.8%	[7.8%, 7.8%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	7.8%	[7.8%, 7.8%]	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: 771.079s -> 769.463s (-0.21%)
Artifact size: 341.43 MiB -> 341.36 MiB (-0.02%)