Teach the autoconf machinery about the PS4 triple.

(I think the last checkin, r227060, got lost from the mailing lists because of the (R) in the comment.)

llvm-svn: 227090
diff --git a/llvm/autoconf/configure.ac b/llvm/autoconf/configure.ac
index 7f7fcf8..0cdd147 100644
--- a/llvm/autoconf/configure.ac
+++ b/llvm/autoconf/configure.ac
@@ -369,6 +369,8 @@
     llvm_cv_target_os_type="NativeClient" ;;
   *-unknown-eabi*)
     llvm_cv_target_os_type="Freestanding" ;;
+  *-*-ps4)
+    llvm_cv_target_os_type="PS4" ;;
   *)
     llvm_cv_target_os_type="Unknown" ;;
 esac])