Various refactors to the LTO handling code (part 2) Continuing from https://github.com/rust-lang/rust/pull/143388 this removes a bit of dead code and moves the LTO symbol export calculation from individual backends to cg_ssa.
is_multiple_of
.att_syntax
codegen_instance_attrs
p-
warn(unreachable_pub)
rustc_codegen_llvm