Fix typo in assembly directive. Noticed by inspection.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157726 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCAsmStreamer.cpp b/lib/MC/MCAsmStreamer.cpp
index 9497b6b..1b7d037 100644
--- a/lib/MC/MCAsmStreamer.cpp
+++ b/lib/MC/MCAsmStreamer.cpp
@@ -1025,7 +1025,7 @@
   if (!UseCFI)
     return;
 
-  OS << "\t.cif_signal_frame";
+  OS << "\t.cfi_signal_frame";
   EmitEOL();
 }