Use single instance of PhoneNumberUtilsWrapper

PhoneNumberUtilsWrapper is creating a new instance of the class
everytime it tries to look up an unknown number. Just use a single
instance for this instead to avoid redundant object creation.

Change-Id: I418d95ced42c1db06c63848768050a181defb347
diff --git a/src/com/android/dialer/calllog/PhoneNumberUtilsWrapper.java b/src/com/android/dialer/calllog/PhoneNumberUtilsWrapper.java
index 32b49b3..242be2d 100644
--- a/src/com/android/dialer/calllog/PhoneNumberUtilsWrapper.java
+++ b/src/com/android/dialer/calllog/PhoneNumberUtilsWrapper.java
@@ -28,7 +28,7 @@
  *
  */
 public class PhoneNumberUtilsWrapper {
-
+    private static final PhoneNumberUtilsWrapper INSTANCE = new PhoneNumberUtilsWrapper();
     private static final Set<String> LEGACY_UNKNOWN_NUMBERS = Sets.newHashSet("-1", "-2", "-3");
 
     /** Returns true if it is possible to place a call to the given number. */
@@ -74,7 +74,7 @@
         if (TextUtils.isEmpty(number)) {
             return false;
         }
-        if (new PhoneNumberUtilsWrapper().isVoicemailNumber(number)) {
+        if (INSTANCE.isVoicemailNumber(number)) {
             return false;
         }
         if (isLegacyUnknownNumbers(number.toString())) {