Add support for autodetection of ADM bdver2.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176130 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Host.cpp b/lib/Support/Host.cpp
index afbf0bf..b9bbcb9 100644
--- a/lib/Support/Host.cpp
+++ b/lib/Support/Host.cpp
@@ -331,7 +331,10 @@
       case 20:
         return "btver1";
       case 21:
-        return "bdver1";
+        if (Model <= 15)
+          return "bdver1";
+        else if (Model <= 31)
+          return "bdver2";
     default:
       return "generic";
     }