[Support][X86] Add a few more Intel model numbers to getHostCPUName for airmont and knl.

llvm-svn: 267670
diff --git a/llvm/lib/Support/Host.cpp b/llvm/lib/Support/Host.cpp
index 98c9f3d..247f8fd 100644
--- a/llvm/lib/Support/Host.cpp
+++ b/llvm/lib/Support/Host.cpp
@@ -390,8 +390,12 @@
       case 0x4d:
       case 0x5a:
       case 0x5d:
+      case 0x4c: // really airmont
         return "silvermont";
 
+      case 0x57:
+        return "knl";
+
       default: // Unknown family 6 CPU, try to guess.
         if (HasAVX512)
           return "knl";