Auto merge of #143667 - tgross35:rollup-yqitltm, r=tgross35

Rollup of 9 pull requests

Successful merges:

 - rust-lang/rust#142357 (Simplify LLVM bitcode linker in bootstrap and add tests for it)
 - rust-lang/rust#143177 (Remove false label when `self` resolve failure does not relate to macro)
 - rust-lang/rust#143339 (Respect endianness correctly in CheckEnums test suite)
 - rust-lang/rust#143426 (clippy fix: indentation)
 - rust-lang/rust#143475 (tests: Use `cfg_target_has_reliable_f16_f128` in `conv-bits-runtime-const`)
 - rust-lang/rust#143499 (Don't call `predicates_of` on a dummy obligation cause's body id)
 - rust-lang/rust#143520 (Fix perf regression caused by tracing)
 - rust-lang/rust#143532 (More carefully consider span context when suggesting remove `&mut`)
 - rust-lang/rust#143606 (configure.py: Write last key in each section)

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

Author: bors

src/machine.rs

@@ -1014,8 +1014,6 @@ impl<'tcx> Machine<'tcx> for MiriMachine<'tcx> {
 
     const PANIC_ON_ALLOC_FAIL: bool = false;
 
-    const TRACING_ENABLED: bool = cfg!(feature = "tracing");
-
     #[inline(always)]
     fn enforce_alignment(ecx: &MiriInterpCx<'tcx>) -> bool {
         ecx.machine.check_alignment != AlignmentCheck::None
@@ -1827,6 +1825,16 @@ impl<'tcx> Machine<'tcx> for MiriMachine<'tcx> {
         #[cfg(not(target_os = "linux"))]
         MiriAllocParams::Global
     }
+
+    fn enter_trace_span(span: impl FnOnce() -> tracing::Span) -> impl EnteredTraceSpan {
+        #[cfg(feature = "tracing")]
+        { span().entered() }
+        #[cfg(not(feature = "tracing"))]
+        {
+            let _ = span; // so we avoid the "unused variable" warning
+            ()
+        }
+    }
 }
 
 /// Trait for callbacks handling asynchronous machine operations.