The default CPU on FreeBSD for i386 should be i486, not pentium4.

Patch by Dimitry Andric!

llvm-svn: 126763
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 0205cf6..3e6f748 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -726,6 +726,11 @@
         CPUName = "x86-64";
       else if (getToolChain().getArchName() == "i386")
         CPUName = "i486";
+    } else if (getToolChain().getOS().startswith("freebsd"))  {
+      if (getToolChain().getArchName() == "x86_64")
+        CPUName = "x86-64";
+      else if (getToolChain().getArchName() == "i386")
+        CPUName = "i486";
     } else if (getToolChain().getOS().startswith("netbsd"))  {
       if (getToolChain().getArchName() == "x86_64")
         CPUName = "x86-64";