Revert of [simd.js] Disable SIMD polyfill.

test/simdjs/SimdJs.json

 {
   "flags": [
     "--harmony-object",
     "test/simdjs/harness-adapt.js"
   ],
   "name": "SIMDJS",
   "path": [
     "../../"
   ],
   "resources": [
     "test/simdjs/data/src/benchmarks/base.js",
+    "test/simdjs/data/src/ecmascript_simd.js",
     "test/simdjs/harness-adapt.js",
     "test/simdjs/harness-finish.js",
     "test/simdjs/data/src/benchmarks/kernel-template.js",
     "test/simdjs/data/src/benchmarks/averageFloat32x4.js",
     "test/simdjs/data/src/benchmarks/averageFloat32x4LoadFromInt8Array.js",
     "test/simdjs/data/src/benchmarks/averageFloat32x4LoadX.js",
     "test/simdjs/data/src/benchmarks/averageFloat32x4LoadXY.js",
     "test/simdjs/data/src/benchmarks/averageFloat32x4LoadXYZ.js",
     "test/simdjs/data/src/benchmarks/matrix-multiplication.js",
     "test/simdjs/data/src/benchmarks/transform.js",
@@ skipping 212 matching lines @@
         },
         {
           "name": "Non-SIMD"
         }
       ]
     }
   ],
   "timeout_arm": 240,
   "timeout_arm64": 120,
   "units": "ms"
-}
+}