Auto merge of #146879 - Zalathar:rollup-vm97j8b, r=Zalathar

Rollup of 9 pull requests

Successful merges:

 - rust-lang/rust#145411 (regression test for Cow<[u8]> layout)
 - rust-lang/rust#146397 (std_detect on Darwin AArch64: update features)
 - rust-lang/rust#146791 (emit attribute for readonly non-pure inline assembly)
 - rust-lang/rust#146831 (Support ctr and lr as clobber-only registers in PowerPC inline assembly)
 - rust-lang/rust#146838 (Introduce "wrapper" helpers to rustdoc)
 - rust-lang/rust#146845 (Add self-profile events for target-machine creation)
 - rust-lang/rust#146846 (btree InternalNode::new safety comments)
 - rust-lang/rust#146858 (Make mips64el-unknown-linux-muslabi64 link dynamically)
 - rust-lang/rust#146878 (assert_unsafe_precondition: fix some incorrect check_language_ub)

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

1 files changed, 10 insertions, 0 deletions

diff --git a/compiler/rustc_codegen_llvm/src/back/write.rs b/compiler/rustc_codegen_llvm/src/back/write.rs
index c4881f0aafc..1950b8288d1 100644
--- a/compiler/rustc_codegen_llvm/src/back/write.rs
+++ b/compiler/rustc_codegen_llvm/src/back/write.rs
@@ -204,6 +204,9 @@ pub(crate) fn target_machine_factory(
     optlvl: config::OptLevel,
     target_features: &[String],
 ) -> TargetMachineFactoryFn<LlvmCodegenBackend> {
+    // Self-profile timer for creating a _factory_.
+    let _prof_timer = sess.prof.generic_activity("target_machine_factory");
+
     let reloc_model = to_llvm_relocation_model(sess.relocation_model());
 
     let (opt_level, _) = to_llvm_opt_settings(optlvl);
@@ -259,6 +262,9 @@ pub(crate) fn target_machine_factory(
         .into_string()
         .unwrap_or_default();
     let command_line_args = quote_command_line_args(&sess.expanded_args);
+    // Self-profile counter for the number of bytes produced by command-line quoting.
+    // Values are summed, so the summary result is cumulative across all TM factories.
+    sess.prof.artifact_size("quoted_command_line_args", "-", command_line_args.len() as u64);
 
     let debuginfo_compression = sess.opts.debuginfo_compression.to_string();
     match sess.opts.debuginfo_compression {
@@ -281,7 +287,11 @@ pub(crate) fn target_machine_factory(
 
     let use_wasm_eh = wants_wasm_eh(sess);
 
+    let prof = SelfProfilerRef::clone(&sess.prof);
     Arc::new(move |config: TargetMachineFactoryConfig| {
+        // Self-profile timer for invoking a factory to create a target machine.
+        let _prof_timer = prof.generic_activity("target_machine_factory_inner");
+
         let path_to_cstring_helper = |path: Option<PathBuf>| -> CString {
             let path = path.unwrap_or_default();
             let path = path_mapping