Revert CPU detection code to return "generic" instead of an empty string in case

of failure. The x86 target didn't like empty cpu names and broke x86 tests on
non-x86 buildbots.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89111 91177308-0d34-0410-b5e6-96231b3b80d8

lib/System/Host.cpp

@@ -249,7 +249,7 @@ std::string sys::getHostCPUName() {
     }
 
     default:
-      return "";
+      return "generic";
     }
   } else if (memcmp(text.c, "AuthenticAMD", 12) == 0) {
     // FIXME: this poorly matches the generated SubtargetFeatureKV table.  There
@@ -289,10 +289,10 @@ std::string sys::getHostCPUName() {
       case 16:
         return "amdfam10";
     default:
-      return "";
+      return "generic";
     }
   }
 #endif
 
-  return "";
+  return "generic";
 }