Return method reference from RetraceMethodResult

Change-Id: Ia24f2097363345b9c542230405521be67f808718

src/main/java/com/android/tools/r8/retrace/internal/RetraceMethodResultImpl.java

diff --git a/src/main/java/com/android/tools/r8/retrace/internal/RetraceMethodResultImpl.java b/src/main/java/com/android/tools/r8/retrace/internal/RetraceMethodResultImpl.java
index 7e66ec1..735a163 100644
--- a/src/main/java/com/android/tools/r8/retrace/internal/RetraceMethodResultImpl.java
+++ b/src/main/java/com/android/tools/r8/retrace/internal/RetraceMethodResultImpl.java
@@ -152,7 +152,7 @@
 
     @Override
     public RetracedMethodReference getRetracedMethod() {
-      return null;
+      return methodReference;
     }
 
     @Override