Optimize PathSet for V8

PathSet.find has been rewritten without using ES6 generators in order
to avoid V8's TurboFan/Crankshift optimization bailout.

lib/device.js

@@ -96,7 +96,7 @@ function getAliasDeclarations(path, timestamp) {
 function unpack(deviceData, path, revision) {
   let allMatches = [];
   if (!path.alias) {
-    for (let p of deviceData.paths.subset(path, 0))
+    for (let p of deviceData.paths.find(path, false, true))
       if (deviceData.attributes.has(p, revision))
         allMatches.push(p);
   }
@@ -109,7 +109,7 @@ function unpack(deviceData, path, revision) {
         wildcardPath.wildcard |= 1 << i;
       }
 
-    for (let p of deviceData.paths.subset(wildcardPath, 0))
+    for (let p of deviceData.paths.find(wildcardPath, false, true))
       if (deviceData.attributes.has(p, revision))
         allMatches.push(p);
 
@@ -169,7 +169,7 @@ function unpack(deviceData, path, revision) {
 
 
 function clear(deviceData, path, timestamp, attributes) {
-  for (let p of deviceData.paths.all(path, timestamp ? 99 : 0)) {
+  for (let p of deviceData.paths.find(path, true, true, timestamp ? 99 : path.length)) {
     for (let k in deviceData.trackers.get(p))
       deviceData.changes.add(k);
 
@@ -279,7 +279,7 @@ function set(deviceData, path, timestamp, attributes, toClear) {
       }
 
       if (changeFlags)
-        for (let sup of deviceData.paths.superset(path)) {
+        for (let sup of deviceData.paths.find(path, true, false)) {
           let c = deviceData.trackers.get(sup);
           for (let k in c)
             if (c[k] & changeFlags) {
@@ -309,7 +309,7 @@ function set(deviceData, path, timestamp, attributes, toClear) {
     }
 
     if (path.wildcard)
-      for (let sub of deviceData.paths.subset(path))
+      for (let sub of deviceData.paths.find(path, false, true))
         if (timestamp > deviceData.timestamps.get(sub)) {
           deviceData.timestamps.delete(sub);
           if (deviceData.attributes.delete(sub)) {