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

Author: bors

src/asm.rs

@@ -698,8 +698,12 @@ fn reg_class_to_gcc(reg_class: InlineAsmRegClass) -> &'static str {
         InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::reg_nonzero) => "b",
         InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::freg) => "f",
         InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::vreg) => "v",
-        InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::cr)
-        | InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::xer) => {
+        InlineAsmRegClass::PowerPC(
+            PowerPCInlineAsmRegClass::cr
+            | PowerPCInlineAsmRegClass::ctr
+            | PowerPCInlineAsmRegClass::lr
+            | PowerPCInlineAsmRegClass::xer,
+        ) => {
             unreachable!("clobber-only")
         }
         InlineAsmRegClass::RiscV(RiscVInlineAsmRegClass::reg) => "r",
@@ -777,8 +781,12 @@ fn dummy_output_type<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, reg: InlineAsmRegCl
         InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::vreg) => {
             cx.type_vector(cx.type_i32(), 4)
         }
-        InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::cr)
-        | InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::xer) => {
+        InlineAsmRegClass::PowerPC(
+            PowerPCInlineAsmRegClass::cr
+            | PowerPCInlineAsmRegClass::ctr
+            | PowerPCInlineAsmRegClass::lr
+            | PowerPCInlineAsmRegClass::xer,
+        ) => {
             unreachable!("clobber-only")
         }
         InlineAsmRegClass::RiscV(RiscVInlineAsmRegClass::reg) => cx.type_i32(),