Add 'compiler/rustc_codegen_gcc/' from commit 'afae271d5d'

git-subtree-dir: compiler/rustc_codegen_gcc
git-subtree-mainline: ae90dcf020
git-subtree-split: afae271d5d

compiler/rustc_codegen_gcc/prepare.sh

@@ -0,0 +1,22 @@
+#!/bin/bash --verbose
+set -e
+
+source prepare_build.sh
+
+cargo install hyperfine || echo "Skipping hyperfine install"
+
+git clone https://github.com/rust-lang/regex.git || echo "rust-lang/regex has already been cloned"
+pushd regex
+git checkout -- .
+git checkout 341f207c1071f7290e3f228c710817c280c8dca1
+popd
+
+git clone https://github.com/ebobby/simple-raytracer || echo "ebobby/simple-raytracer has already been cloned"
+pushd simple-raytracer
+git checkout -- .
+git checkout 804a7a21b9e673a482797aa289a18ed480e4d813
+
+# build with cg_llvm for perf comparison
+cargo build
+mv target/debug/main raytracer_cg_llvm
+popd