For non-x86 host, used generic as CPU name.

llvm-svn: 134741
diff --git a/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp b/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
index bcde60a..204485d 100644
--- a/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
+++ b/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
@@ -140,8 +140,13 @@
   }
 
   std::string CPUName = CPU;
-  if (CPUName.empty())
+  if (CPUName.empty()) {
+#if defined (__x86_64__) || defined(__i386__)
     CPUName = sys::getHostCPUName();
+#else
+    CPUName = "generic";
+#endif
+  }
 
   if (ArchFS.empty() && CPUName.empty() && hasX86_64())
     // Auto-detect if host is 64-bit capable, it's the default if true.