Use system specific separator to run correctly on windows

Change-Id: I334739b9a94cbd650e8d835c6220ee9a3b1e8da1
diff --git a/src/test/java/com/android/tools/r8/regress/b316744331/Regress316744331Test.java b/src/test/java/com/android/tools/r8/regress/b316744331/Regress316744331Test.java
index bf6229b..e3e6058 100644
--- a/src/test/java/com/android/tools/r8/regress/b316744331/Regress316744331Test.java
+++ b/src/test/java/com/android/tools/r8/regress/b316744331/Regress316744331Test.java
@@ -26,12 +26,12 @@
 
   static final String EXPECTED = StringUtils.lines("No null fields");
 
-  static final int ENTRY_LINE = 22;
-  static final int IN_STREAM_CHECK_LINE = 23;
-  static final int IN_STREAM_IS_NULL_LINE = 24;
-  static final int OUT_STREAM_CHECK_LINE = 29;
-  static final int OUT_STREAM_IS_NULL_LINE = 30;
-  static final int NORMAL_EXIT_LINE = 33;
+  static final int ENTRY_LINE = 23;
+  static final int IN_STREAM_CHECK_LINE = ENTRY_LINE + 1;
+  static final int IN_STREAM_IS_NULL_LINE = ENTRY_LINE + 2;
+  static final int OUT_STREAM_CHECK_LINE = ENTRY_LINE + 7;
+  static final int OUT_STREAM_IS_NULL_LINE = ENTRY_LINE + 8;
+  static final int NORMAL_EXIT_LINE = ENTRY_LINE + 11;
 
   static final Value NULL_VALUE = Value.createObjectValue(Tag.OBJECT_TAG, 0);
 
diff --git a/src/test/java/com/android/tools/r8/regress/b316744331/Regress316744331TestClass.java b/src/test/java/com/android/tools/r8/regress/b316744331/Regress316744331TestClass.java
index e7d2583..1a57586 100644
--- a/src/test/java/com/android/tools/r8/regress/b316744331/Regress316744331TestClass.java
+++ b/src/test/java/com/android/tools/r8/regress/b316744331/Regress316744331TestClass.java
@@ -4,6 +4,7 @@
 
 package com.android.tools.r8.regress.b316744331;
 
+import java.io.File;
 import java.io.FileReader;
 import java.io.IOException;
 import java.io.PrintWriter;
@@ -41,7 +42,7 @@
     if (jarIndex < 0) {
       jarIndex = cp.indexOf(".zip");
     }
-    int start = cp.lastIndexOf(':', jarIndex);
+    int start = cp.lastIndexOf(File.pathSeparatorChar, jarIndex);
     String filename = cp.substring(Math.max(start, 0), jarIndex + 4);
     new Regress316744331TestClass(filename).foo();
   }