TableGen: Use 'enum : uint64_t' for feature flags to fix -Wmicrosoft

clang-cl would warn that this value is not representable in 'int':
  enum { FeatureX = 1ULL << 31 };
All MS enums are 'ints' unless otherwise specified, so we have to use an
explicit type.  The AMDGPU target just hit 32 features, triggering this
warning.

Now that we have C++11 strong enum types, we can also eliminate the
'const uint64_t' codepath from tablegen and just use 'enum : uint64_t'.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231697 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/XCore/MCTargetDesc/XCoreMCTargetDesc.h

@@ -14,6 +14,8 @@
 #ifndef LLVM_LIB_TARGET_XCORE_MCTARGETDESC_XCOREMCTARGETDESC_H
 #define LLVM_LIB_TARGET_XCORE_MCTARGETDESC_XCOREMCTARGETDESC_H
 
+#include "llvm/Support/DataTypes.h"
+
 namespace llvm {
 class Target;