Fix L8 command-line parsing of --pg-conf flag

Change-Id: I8b1c4925fc4957268292120e1772aa6201064cb9
diff --git a/src/main/java/com/android/tools/r8/L8CommandParser.java b/src/main/java/com/android/tools/r8/L8CommandParser.java
index 0802127..e083cec 100644
--- a/src/main/java/com/android/tools/r8/L8CommandParser.java
+++ b/src/main/java/com/android/tools/r8/L8CommandParser.java
@@ -18,8 +18,8 @@
 
 public class L8CommandParser extends BaseCompilerCommandParser<L8Command, L8Command.Builder> {
 
-  private static final Set<String> OPTIONS_WITH_PARAMETER =
-      ImmutableSet.of("--output", "--lib", MIN_API_FLAG, "--desugared-lib", THREAD_COUNT_FLAG);
+  private static final Set<String> OPTIONS_WITH_PARAMETER = ImmutableSet.of(
+      "--output", "--lib", MIN_API_FLAG, "--desugared-lib", THREAD_COUNT_FLAG, "--pg-conf");
 
   public static void main(String[] args) throws CompilationFailedException {
     L8Command command = parse(args, Origin.root()).build();