Remove stale TODO

Change-Id: I34c5fe678f1448919e6a6f33ef9a6d6f2fea40e5
diff --git a/src/main/java/com/android/tools/r8/ir/conversion/StringSwitchConverter.java b/src/main/java/com/android/tools/r8/ir/conversion/StringSwitchConverter.java
index 39fa3f6..689e2e2 100644
--- a/src/main/java/com/android/tools/r8/ir/conversion/StringSwitchConverter.java
+++ b/src/main/java/com/android/tools/r8/ir/conversion/StringSwitchConverter.java
@@ -508,8 +508,6 @@
           return false;
         }
 
-        // TODO(b/135559645): Consider implementing hashCode() on DexString to avoid String
-        //  materialization.
         try {
           if (theString.getValue().decodedHashCode() == hash) {
             BasicBlock trueTarget = theIf.targetFromCondition(1).endOfGotoChain();