Initialize X863DNowLevel.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49808 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index 463b47f..610bf1d 100644
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -241,6 +241,7 @@
   : AsmFlavor(AsmWriterFlavor)
   , PICStyle(PICStyle::None)
   , X86SSELevel(NoMMXSSE)
+  , X863DNowLevel(NoThreeDNow)
   , HasX86_64(false)
   , DarwinVers(0)
   , stackAlignment(8)