Rollup of 7 pull requests

[matthiaskrgr]

Successful merges:

• Check empty SIMD vector in inline asm #135295 (Check empty SIMD vector in inline asm)
• coverage: Prepare for upcoming changes to counter creation #135873 (coverage: Prepare for upcoming changes to counter creation)
• Implement needs-subprocess directive, and cleanup a bunch of tests to use needs-{subprocess,threads} #135926 (Implement needs-subprocess directive, and cleanup a bunch of tests to use needs-{subprocess,threads})
• Tidy Python improvements #135950 (Tidy Python improvements)
• Make Vec::pop_if a bit more presentable #135956 (Make Vec::pop_if a bit more presentable)
• [AIX] Allow different sized load and store in tests/assembly/powerpc64-struct-abi.rs #135966 ([AIX] Allow different sized load and store in tests/assembly/powerpc64-struct-abi.rs)
• Doc difference between extend and extend_from_slice #135983 (Doc difference between extend and extend_from_slice)

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Create a similar rollup

[matthiaskrgr]

@bors r+ rollup=never p=7

[bors]

📌 Commit b511c13 has been approved by matthiaskrgr

It is now in the queue for this repository.

[bors]

⌛ Testing commit b511c13 with merge 62a7968...

[rust-log-analyzer]

The job aarch64-apple failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

test [ui] tests/ui/zero-sized/zero-sized-tuple-struct.rs ... ok

failures:

---- [ui] tests/ui/simd/empty-simd-vector-in-operand.rs stdout ----
Saved the actual stderr to "/Users/runner/work/rust/rust/build/aarch64-apple-darwin/test/ui/simd/empty-simd-vector-in-operand/empty-simd-vector-in-operand.stderr"


+ error: invalid register class `xmm_reg`: unknown register class
+   --> $DIR/empty-simd-vector-in-operand.rs:11:31
+    |
+ LL |         std::arch::asm!("{}", in(xmm_reg) A());
+ 
1 error[E0075]: SIMD vector cannot be empty
2   --> $DIR/empty-simd-vector-in-operand.rs:6:1
3    |
3    |

4 LL | struct A();
5    | ^^^^^^^^
- 
- error: use of empty SIMD vector `A`
-   --> $DIR/empty-simd-vector-in-operand.rs:11:43
-    |
- LL |         std::arch::asm!("{}", in(xmm_reg) A());
12 
13 error: aborting due to 2 previous errors
14 


Note: some mismatched output was normalized before being compared
-   --> /Users/runner/work/rust/rust/tests/ui/simd/empty-simd-vector-in-operand.rs:11:31
+ error: invalid register class `xmm_reg`: unknown register class
+   --> $DIR/empty-simd-vector-in-operand.rs:11:31
+    |
+ LL |         std::arch::asm!("{}", in(xmm_reg) A());
+ 


The actual stderr differed from the expected stderr.
The actual stderr differed from the expected stderr.
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args simd/empty-simd-vector-in-operand.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/Users/runner/work/rust/rust/build/aarch64-apple-darwin/stage2/bin/rustc" "/Users/runner/work/rust/rust/tests/ui/simd/empty-simd-vector-in-operand.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/Users/runner/.cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/Users/runner/work/rust/rust/vendor" "--sysroot" "/Users/runner/work/rust/rust/build/aarch64-apple-darwin/stage2" "--target=aarch64-apple-darwin" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/Users/runner/work/rust/rust/build/aarch64-apple-darwin/test/ui/simd/empty-simd-vector-in-operand" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/Users/runner/work/rust/rust/build/aarch64-apple-darwin/native/rust-test-helpers"
--- stderr -------------------------------
--- stderr -------------------------------
error: invalid register class `xmm_reg`: unknown register class
##[error]  --> /Users/runner/work/rust/rust/tests/ui/simd/empty-simd-vector-in-operand.rs:11:31
   |
LL |         std::arch::asm!("{}", in(xmm_reg) A());

error[E0075]: SIMD vector cannot be empty
##[error]  --> /Users/runner/work/rust/rust/tests/ui/simd/empty-simd-vector-in-operand.rs:6:1
   |

[bors]

💔 Test failed - checks-actions

[jieyouxu]

@bors r-

[jieyouxu]

#135295