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Add `-Zindirect-branch-cs-prefix` Cc: ``@azhogin`` ``@Darksonn`` This goes on top of https://github.com/rust-lang/rust/pull/135927, i.e. please skip the first commit here. Please feel free to inherit it there. In fact, I am not sure if there is any use case for the flag without `-Zretpoline*`. GCC and Clang allow it, though. There is a `FIXME` for two `ignore`s in the test that I took from another test I did in the past -- they may be needed or not here since I didn't run the full CI. Either way, it is not critical. Tracking issue: https://github.com/rust-lang/rust/issues/116852. MCP: https://github.com/rust-lang/compiler-team/issues/868.
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.