Add x64 emitter tests

build.sh

@@ -1,20 +1,4 @@
-# set -euo pipefail
-
-assert_eq() {
-   expected="$1"
-   actual="$2"
-   if [ "$expected" != "$actual" ]; then
-       echo "assert failed: expected '$expected', got '$actual'"
-       exit 1
-   fi
-}
-
-verify_expr() {
-    ./main "$1"
-    clang out.s -o test
-    ./test
-    assert_eq $? $2
-}
+set -euo pipefail
 
 if [[ ! -e build ]]; then
     mkdir build
@@ -23,10 +7,4 @@ cd build
 clang -o meta $(realpath ../meta.c) -g -Wall -Wextra -Wshadow -fdiagnostics-absolute-paths
 ./meta > ../meta_gen.c
 clang -o main $(realpath ../main.c) -g -Wall -Wextra -Wshadow -fdiagnostics-absolute-paths
-
 ./main
-verify_expr "2+1-1" 2
-verify_expr "(2+1-1)*3" 6
-
-
-echo done