Enable inline stack probes on PowerPC and SystemZ

[cuviper]

The LLVM PowerPC and SystemZ targets have both supported "probe-stack"="inline-asm" for longer than our current minimum LLVM 13 requirement, so we can turn this on for all powerpc, powerpc64, powerpc64le, and s390x targets in Rust. These are all tier-2 or lower, so CI does not run their tests, but I have confirmed that their linux-gnu variants do pass on RHEL.

cc #43241

[rust-highfive]

r? @fee1-dead

(rust-highfive has picked a reviewer for you, use r? to override)

[rust-highfive]

⚠️ Warning ⚠️

• These commits modify compiler targets. (See the Target Tier Policy.)

[fee1-dead]

r? rust-lang/compiler

[nagisa]

welp

[cuviper]

A little history on that -- commit cd25807 changed this test from checking "__rust_probestack" to "inline-asm", but then db4c544 fully dropped that check instead of changing it back.

[nagisa]

@bors r+

[bors]

📌 Commit ad8f519 has been approved by nagisa

It is now in the queue for this repository.

[bors]

⌛ Testing commit ad8f519 with merge 8a497b7...

[bors]

☀️ Test successful - checks-actions
Approved by: nagisa
Pushing 8a497b7 to master...

[rust-timer]

Finished benchmarking commit (8a497b7): 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)	2.0%	[2.0%, 2.0%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.8%	[-0.8%, -0.8%]	1
Improvements ✅ (secondary)	-3.5%	[-3.5%, -3.5%]	1
All ❌✅ (primary)	0.6%	[-0.8%, 2.0%]	2

Cycles

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)	6.3%	[6.3%, 6.3%]	1
Regressions ❌ (secondary)	2.8%	[2.7%, 2.8%]	2
Improvements ✅ (primary)	-2.4%	[-2.4%, -2.3%]	2
Improvements ✅ (secondary)	-3.1%	[-3.7%, -2.6%]	2
All ❌✅ (primary)	0.5%	[-2.4%, 6.3%]	3

Footnotes

1. the arithmetic mean of the percent change ↩ ↩²

2. number of relevant changes ↩ ↩²