Unbreak -cc1as mode after MC subtarget changes

llvm-svn: 134877
diff --git a/clang/tools/driver/cc1as_main.cpp b/clang/tools/driver/cc1as_main.cpp
index e3105d0..10da402 100644
--- a/clang/tools/driver/cc1as_main.cpp
+++ b/clang/tools/driver/cc1as_main.cpp
@@ -353,6 +353,7 @@
   InitializeAllTargetInfos();
   // FIXME: We shouldn't need to initialize the Target(Machine)s.
   InitializeAllTargets();
+  InitializeAllMCSubtargetInfos();
   InitializeAllAsmPrinters();
   InitializeAllAsmParsers();