message: Suppress an unnecessary warning and fix an incorrect warning
diff: @@ -224,8 +224,10 @@ pub struct CraneliftCodegenBackend {
  impl CodegenBackend for CraneliftCodegenBackend {
  fn init(&self, sess: &Session) {
  - if sess.lto() != rustc_session::config::Lto::No && sess.opts.cg.embed_bitcode {
  - sess.warn("LTO is not supported. You may get a linker error.");
  + use rustc_session::config::Lto;
  + match sess.lto() {
  + Lto::No | Lto::ThinLocal => {}
  + Lto::Thin | Lto::Fat => sess.warn("LTO is not supported. You may get a linker error."),
  }
  }
  @@ -320,12 +322,9 @@ fn build_isa(sess: &Session) -> Box<dyn isa::TargetIsa + 'static> {
  flags_builder.set("opt_level", "none").unwrap();
  }
  OptLevel::Less | OptLevel::Default => {}
  - OptLevel::Aggressive => {
  + OptLevel::Size | OptLevel::SizeMin | OptLevel::Aggressive => {
  flags_builder.set("opt_level", "speed_and_size").unwrap();
  }
  - OptLevel::Size | OptLevel::SizeMin => {
  - sess.warn("Optimizing for size is not supported. Just ignoring the request");
  - }
  }
  let flags = settings::Flags::new(flags_builder);
  