Auto merge of #137900 - matthiaskrgr:rollup-rvan5ao, r=matthiaskrgr

Rollup of 10 pull requests

Successful merges:

 - #137375 (Minor internal comments fix for `BufRead::read_line`)
 - #137641 (More precisely document `Global::deallocate()`'s safety.)
 - #137755 (doc: update Wasmtime flags)
 - #137851 (improve `simd_select` error message when used with invalid mask type)
 - #137860 (rustc_target: Add msync target feature and enable it on powerpcspe targets)
 - #137871 (fix `RangeBounds::is_empty` documentation)
 - #137873 (Disable `f16` on Aarch64 without `neon`)
 - #137876 (Adjust triagebot.toml entries for `rustc_mir_build/src/builder/`)
 - #137883 (edit mailmap)
 - #137886 (`name()` and `trimmed_name()` for `stable_mir::crate_def::DefId`)

r? `@ghost`
`@rustbot` modify labels: rollup

4 files changed, 17 insertions, 4 deletions

diff --git a/library/alloc/src/alloc.rs b/library/alloc/src/alloc.rs
index e686a02f29b..3bfdc68dcda 100644
--- a/library/alloc/src/alloc.rs
+++ b/library/alloc/src/alloc.rs
@@ -264,8 +264,14 @@ unsafe impl Allocator for Global {
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) {
         if layout.size() != 0 {
-            // SAFETY: `layout` is non-zero in size,
-            // other conditions must be upheld by the caller
+            // SAFETY:
+            // * We have checked that `layout` is non-zero in size.
+            // * The caller is obligated to provide a layout that "fits", and in this case,
+            //   "fit" always means a layout that is equal to the original, because our
+            //   `allocate()`, `grow()`, and `shrink()` implementations never returns a larger
+            //   allocation than requested.
+            // * Other conditions must be upheld by the caller, as per `Allocator::deallocate()`'s
+            //   safety documentation.
             unsafe { dealloc(ptr.as_ptr(), layout) }
         }
     }
diff --git a/library/core/src/ops/range.rs b/library/core/src/ops/range.rs
index e0c442e5292..1935268cda8 100644
--- a/library/core/src/ops/range.rs
+++ b/library/core/src/ops/range.rs
@@ -827,7 +827,7 @@ pub trait RangeBounds<T: ?Sized> {
     }
 
     /// Returns `true` if the range contains no items.
-    /// One-sided ranges (`RangeFrom`, etc) always return `true`.
+    /// One-sided ranges (`RangeFrom`, etc) always return `false`.
     ///
     /// # Examples
     ///
diff --git a/library/std/build.rs b/library/std/build.rs
index 723d1eb02e0..9df35ce3cc8 100644
--- a/library/std/build.rs
+++ b/library/std/build.rs
@@ -12,6 +12,11 @@ fn main() {
         .expect("CARGO_CFG_TARGET_POINTER_WIDTH was not set")
         .parse()
         .unwrap();
+    let target_features: Vec<_> = env::var("CARGO_CFG_TARGET_FEATURE")
+        .unwrap_or_default()
+        .split(",")
+        .map(ToOwned::to_owned)
+        .collect();
     let is_miri = env::var_os("CARGO_CFG_MIRI").is_some();
 
     println!("cargo:rustc-check-cfg=cfg(netbsd10)");
@@ -101,6 +106,8 @@ fn main() {
         ("s390x", _) => false,
         // Unsupported <https://github.com/llvm/llvm-project/issues/94434>
         ("arm64ec", _) => false,
+        // LLVM crash <https://github.com/llvm/llvm-project/issues/129394>
+        ("aarch64", _) if !target_features.iter().any(|f| f == "neon") => false,
         // MinGW ABI bugs <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115054>
         ("x86_64", "windows") if target_env == "gnu" && target_abi != "llvm" => false,
         // Infinite recursion <https://github.com/llvm/llvm-project/issues/97981>
diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
index 980ea1478e0..7f610bc88bf 100644
--- a/library/std/src/io/mod.rs
+++ b/library/std/src/io/mod.rs
@@ -2534,7 +2534,7 @@ pub trait BufRead: Read {
     fn read_line(&mut self, buf: &mut String) -> Result<usize> {
         // Note that we are not calling the `.read_until` method here, but
         // rather our hardcoded implementation. For more details as to why, see
-        // the comments in `read_to_end`.
+        // the comments in `default_read_to_string`.
         unsafe { append_to_string(buf, |b| read_until(self, b'\n', b)) }
     }