Enable binaryArithmeticTests.js

Use saner WAST syntax in binaryArithmeticTests.wast. Enable running the
test from `runtests`.

This ensures that all tests in wasm.simd are running and text and binary
files are consistent with each other.

test/wasm.simd/rlexe.xml

@@ -54,6 +54,12 @@
     <compile-flags> -wasm -wasmsimd</compile-flags>
   </default>
 </test>
+<test>
+  <default>
+    <files>binaryArithmeticTests.js</files>
+    <compile-flags> -wasm -wasmsimd</compile-flags>
+  </default>
+</test>
 <test>
   <default>
     <files>int64x2Tests.js</files>