Add sink that keeps results observable

timings/src/main/java/com/ankurm/vectorapi/Sink.java

@@ -0,0 +1,10 @@
+package com.ankurm.vectorapi;
+
+/** Keeps computed values observable so the JIT cannot delete the computation. */
+public final class Sink {
+    public static volatile float sink;
+
+    public static void consume(float v) { sink = v; }
+
+    private Sink() {}
+}