Add a missing triple spotted by inspecting and testing of the include
path triples. Also order the 32-bit triples a bit more reasonably.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@143873 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index 07be52b..2844f92 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -1674,10 +1674,11 @@
     static const char *const X86LibDirs[] = { "/lib32", "/lib" };
     static const char *const X86Triples[] = {
       "i686-linux-gnu",
-      "i386-linux-gnu",
       "i686-pc-linux-gnu",
       "i486-linux-gnu",
+      "i386-linux-gnu",
       "i686-redhat-linux",
+      "i586-redhat-linux",
       "i386-redhat-linux",
       "i586-suse-linux",
       "i486-slackware-linux"