Consistent naming

Author: mcculls

utils/src/main/java/datadog/instrument/utils/ClassNameFilter.java

@@ -56,11 +56,11 @@ public boolean contains(CharSequence className) {
 
     // try to find matching slot, rehashing after each attempt
     for (int i = 1, h = hash; true; i++, h = rehash(h)) {
-      long codeAndHash = members[slotMask & h];
-      if (codeAndHash != 0) {
+      long existing = members[slotMask & h];
+      if (existing != 0) {
         // check hash first as it's cheap, then check class-code
-        if ((int) codeAndHash == hash) {
-          return checkClassCode(className, (int) (codeAndHash >>> 32));
+        if ((int) existing == hash) {
+          return checkClassCode(className, (int) (existing >>> 32));
         } else if (i < MAX_HASH_ATTEMPTS) {
           continue; // rehash and try again
         }