[x86] Enable Broadwell target.

Added FeatureSMAP.

Broadwell ISA includes Haswell ISA + ADX + RDSEED + SMAP


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216161 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86Subtarget.cpp

@@ -281,6 +281,7 @@ void X86Subtarget::initializeEnvironment() {
   HasSGX = false;
   HasPRFCHW = false;
   HasRDSEED = false;
+  HasSMAP = false;
   IsBTMemSlow = false;
   IsSHLDSlow = false;
   IsUAMemFast = false;