Use toAbsolutePath before relativize in ExtractMarkers.

R=zerny@google.com

Change-Id: I022cb577551da156693fcff2f0ec08172664f534
diff --git a/src/main/java/com/android/tools/r8/ExtractMarker.java b/src/main/java/com/android/tools/r8/ExtractMarker.java
index 100105f..6fd04b6 100644
--- a/src/main/java/com/android/tools/r8/ExtractMarker.java
+++ b/src/main/java/com/android/tools/r8/ExtractMarker.java
@@ -121,7 +121,7 @@
             "Failed to read dex/vdex file `" + programFile + "`: '" + e.getMessage() + "'");
         continue;
       }
-      System.out.print("In file: " + cwd.relativize(programFile));
+      System.out.print("In file: " + cwd.toAbsolutePath().relativize(programFile.toAbsolutePath()));
       System.out.println(", " + extractDexSize(programFile) + " bytes:");
       for (Marker marker : markers) {
         if (marker == null) {