Keep GlobalSyntheticsGeneratorCommand to allow building it

Change-Id: I275f5819b6effd0ee211c2c7289348797e7549da
diff --git a/src/main/java/com/android/tools/r8/GlobalSyntheticsGeneratorCommand.java b/src/main/java/com/android/tools/r8/GlobalSyntheticsGeneratorCommand.java
index 4844154..1d85164 100644
--- a/src/main/java/com/android/tools/r8/GlobalSyntheticsGeneratorCommand.java
+++ b/src/main/java/com/android/tools/r8/GlobalSyntheticsGeneratorCommand.java
@@ -152,6 +152,7 @@
    *
    * <p>A builder is obtained by calling {@link GlobalSyntheticsGeneratorCommand#builder}.
    */
+  @Keep
   public static class Builder {
 
     private ProgramConsumer programConsumer = null;
diff --git a/third_party/binary_compatibility_tests/compiler_api_tests.tar.gz.sha1 b/third_party/binary_compatibility_tests/compiler_api_tests.tar.gz.sha1
index fa99973..94616ba 100644
--- a/third_party/binary_compatibility_tests/compiler_api_tests.tar.gz.sha1
+++ b/third_party/binary_compatibility_tests/compiler_api_tests.tar.gz.sha1
@@ -1 +1 @@
-78fdbea62f5a3ba7e0ad5d7bc9c19dbc60ed3f79
\ No newline at end of file
+13ccbabcc23194ef50c8c3331bf4ef7cee364b75
\ No newline at end of file