Directly raise fatal errors inside the codegen backends

Author: beamandala

compiler/rustc_codegen_gcc/src/back/lto.rs

@@ -30,7 +30,6 @@ use rustc_codegen_ssa::traits::*;
 use rustc_codegen_ssa::{ModuleCodegen, ModuleKind, looks_like_rust_object_file};
 use rustc_data_structures::memmap::Mmap;
 use rustc_errors::DiagCtxtHandle;
-use rustc_log::tracing::info;
 use rustc_middle::bug;
 use rustc_middle::dep_graph::WorkProduct;
 use rustc_session::config::Lto;

compiler/rustc_codegen_gcc/src/lib.rs

@@ -100,7 +100,7 @@ use rustc_middle::util::Providers;
 use rustc_session::Session;
 use rustc_session::config::{OptLevel, OutputFilenames};
 use rustc_span::Symbol;
-use rustc_target::spec::{Arch, RelocModel};
+use rustc_target::spec::RelocModel;
 use tempfile::TempDir;
 
 use crate::back::lto::ModuleBuffer;