asan: set  ASAN_ALLOCATOR_VERSION=1 back

llvm-svn: 172184
diff --git a/compiler-rt/lib/asan/asan_allocator.h b/compiler-rt/lib/asan/asan_allocator.h
index bc0419c..093b605 100644
--- a/compiler-rt/lib/asan/asan_allocator.h
+++ b/compiler-rt/lib/asan/asan_allocator.h
@@ -23,7 +23,7 @@
 // to a new one (version 2). The change is quite intrusive so both allocators
 // will co-exist in the source base for a while. The actual allocator is chosen
 // at build time by redefining this macrozz.
-#define ASAN_ALLOCATOR_VERSION 2
+#define ASAN_ALLOCATOR_VERSION 1
 
 namespace __asan {