[sanitizer] Fix sanitizer-x86_64-linux-gn script

git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@370134 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/zorg/buildbot/builders/sanitizers/buildbot_gn.sh b/zorg/buildbot/builders/sanitizers/buildbot_gn.sh
index 97a90b2..0467c0c 100755
--- a/zorg/buildbot/builders/sanitizers/buildbot_gn.sh
+++ b/zorg/buildbot/builders/sanitizers/buildbot_gn.sh
@@ -8,6 +8,8 @@
 ROOT=`pwd`
 PLATFORM=`uname`
 
+USE_GIT=1
+
 CHECK_LIBCXX=${CHECK_LIBCXX:-0}
 CHECK_LLD=${CHECK_LLD:-1}
 STAGE1_CLOBBER=