Move almost all of cg_llvm/back/link.rs to cg_ssa

Cargo.lock

@@ -2634,6 +2634,7 @@ dependencies = [
  "serialize 0.0.0",
  "syntax 0.0.0",
  "syntax_pos 0.0.0",
+ "tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]

src/librustc_codegen_llvm/lib.rs

@@ -44,8 +44,6 @@ extern crate rustc_fs_util;
 #[macro_use] extern crate syntax;
 extern crate syntax_pos;
 extern crate rustc_errors as errors;
-extern crate serialize;
-extern crate tempfile;
 
 use rustc_codegen_ssa::traits::*;
 use rustc_codegen_ssa::back::write::{CodegenContext, ModuleConfig, FatLTOInput};
@@ -78,8 +76,6 @@ mod back {
     pub mod link;
     pub mod lto;
     pub mod write;
-    mod rpath;
-    pub mod wasm;
 }
 
 mod abi;

src/librustc_codegen_ssa/Cargo.toml

@@ -20,6 +20,7 @@ log = "0.4.5"
 libc = "0.2.44"
 jobserver = "0.1.11"
 parking_lot = "0.7"
+tempfile = "3.0.5"
 
 serialize = { path = "../libserialize" }
 syntax = { path = "../libsyntax" }

src/librustc_codegen_ssa/back/mod.rs

@@ -5,3 +5,5 @@ pub mod link;
 pub mod command;
 pub mod symbol_export;
 pub mod archive;
+pub mod rpath;
+pub mod wasm;