Auto merge of #159579 - JonathanBrouwer:rollup-TlvztYP, r=JonathanBrouwer

Rollup of 5 pull requests

Successful merges:

 - rust-lang/rust#159188 (Always generate private and hidden items in JSON docs of the stdlib)
 - rust-lang/rust#159567 (Update rustc crate crossbeam-epoch to 0.9.20)
 - rust-lang/rust#150732 (Convert `-Ctarget-cpu` into a target-modifier for AVR, AMDGCN and NVPTX )
 - rust-lang/rust#159549 (restrict const-eval-related 'content' triggers to library/ folder)
 - rust-lang/rust#159570 (fix ICE in opsem inhabitedness check)

Author: bors

src/lib.rs

@@ -42,7 +42,7 @@ use rustc_codegen_ssa::{CompiledModules, CrateInfo, TargetConfig, back};
 use rustc_log::tracing::info;
 use rustc_middle::dep_graph::WorkProductMap;
 use rustc_session::Session;
-use rustc_session::config::OutputFilenames;
+use rustc_session::config::{NATIVE_CPU, OutputFilenames};
 use rustc_span::{Symbol, sym};
 use rustc_target::spec::{Arch, CfgAbi, Env, Os};
 
@@ -341,7 +341,7 @@ fn build_isa(sess: &Session, jit: bool) -> Arc<dyn TargetIsa + 'static> {
     let flags = settings::Flags::new(flags_builder);
 
     let isa_builder = match sess.opts.cg.target_cpu.as_deref() {
-        Some("native") => cranelift_native::builder_with_options(true).unwrap(),
+        Some(NATIVE_CPU) => cranelift_native::builder_with_options(true).unwrap(),
         Some(value) => {
             let mut builder =
                 cranelift_codegen::isa::lookup(target_triple.clone()).unwrap_or_else(|err| {