remove use of template literals in plugin regression exec test for unsupported environments

packages/babel-core/test/fixtures/plugins/regression-2772/exec.js

@@ -1,11 +1,11 @@
-var code = `
-(function() {
-  function foo(b){
-    b === "lol";
-    foo(b);
-  }
-})();
-`;
+var code = multiline([
+  "(function() {",
+  "  function foo(b){",
+  '    b === "lol";',
+  "    foo(b);",
+  "  }",
+  "})();",
+]);
 
 transform(code, {
   plugins: [
@@ -18,10 +18,12 @@ transform(code, {
             if (path.node.seen) {
               return;
             }
+
             var node = t.blockStatement(path.node.body);
             node.seen = true;
             path.replaceWith(node);
           },
+
           // do type inference
           BinaryExpression: function(path) {
             var left  = path.get("left");
@@ -31,7 +33,5 @@ transform(code, {
         }
       };
     }
-  ],
-  compact: true,
-  comments: false,
-}).code;
+  ]
+});