Update parallel benchmarks (Promise + Compose)

* Don't create object every time in Promise resolve
* Collect results in an array in Compose bench as it is dome
  in Promise.all

tests/load/parallel.compose.js

@@ -27,7 +27,7 @@ const testCompose = done => {
   };
 
   const f1 = metasync([[p1, p2, p3, p4, p5, p6]]);
-  f1(done);
+  f1([], done);
 };
 
 benchmark.do(COUNT, [testCompose]);

tests/load/parallel.promise.js

@@ -7,25 +7,25 @@ const benchmark = require('./benchmark.js');
 const PromiseAll = done => {
   let i = 0;
   const p1 = new Promise(resolve => {
-    setImmediate(() => resolve({ p1: ++i * 2 }));
+    setImmediate(() => resolve(++i * 2));
   });
   const p2 = new Promise(resolve => {
-    setImmediate(() => resolve({ p2: ++i * 3 }));
+    setImmediate(() => resolve(++i * 3));
   });
   const p3 = new Promise(resolve => {
-    setImmediate(() => resolve({ p3: ++i * 5 }));
+    setImmediate(() => resolve(++i * 5));
   });
   const p4 = new Promise(resolve => {
-    setImmediate(() => resolve({ p4: 'key ' + ++i }));
+    setImmediate(() => resolve('key ' + ++i));
   });
   const p5 = new Promise(resolve => {
-    setImmediate(() => resolve({ p5: ++i === 5 }));
+    setImmediate(() => resolve(++i === 5));
   });
   const p6 = new Promise(resolve => {
-    setImmediate(() => resolve({ p6: 'key' + ++i * 2 }));
+    setImmediate(() => resolve('key' + ++i * 2));
   });
 
-  Promise.all([p1, p2, p3, p4, p5, p6]).then(res => done(null, res));
+  Promise.all([p1, p2, p3, p4, p5, p6]).then(done.bind(null, null));
 };
 
 benchmark.do(COUNT, [PromiseAll]);