Rollup of 7 pull requests

[matthiaskrgr]

Successful merges:

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• rustc_codegen_llvm: remove outdated asm-to-obj codegen note #135908 (rustc_codegen_llvm: remove outdated asm-to-obj codegen note)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

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