Auto merge of rust-lang#135947 - matthiaskrgr:rollup-k9jpfls, r=matthiaskrgr

Rollup of 7 pull requests

Successful merges:

 - rust-lang#135073 (Implement `ByteStr` and `ByteString` types)
 - rust-lang#135492 (Add missing check for async body when suggesting await on futures.)
 - rust-lang#135766 (handle global trait bounds defining assoc types)
 - rust-lang#135880 (Get rid of RunCompiler)
 - rust-lang#135908 (rustc_codegen_llvm: remove outdated asm-to-obj codegen note)
 - rust-lang#135911 (Allow `arena_cache` queries to return `Option<&'tcx T>`)
 - rust-lang#135920 (simplify parse_format::Parser::ws by using next_if)

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

Author: bors

Cargo.lock

@@ -4260,7 +4260,6 @@ dependencies = [
  "rustc_serialize",
  "rustc_type_ir",
  "rustc_type_ir_macros",
- "smallvec",
  "tracing",
 ]
 

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -769,12 +769,9 @@ pub(crate) unsafe fn codegen(
             }
         }
 
-        // Two things to note:
-        // - If object files are just LLVM bitcode we write bitcode, copy it to
-        //   the .o file, and delete the bitcode if it wasn't otherwise
-        //   requested.
-        // - If we don't have the integrated assembler then we need to emit
-        //   asm from LLVM and use `gcc` to create the object file.
+        // Note that if object files are just LLVM bitcode we write bitcode,
+        // copy it to the .o file, and delete the bitcode if it wasn't
+        // otherwise requested.
 
         let bc_out = cgcx.output_filenames.temp_path(OutputType::Bitcode, module_name);
         let bc_summary_out =