Add support for gcc-compatible -mfprnd -mno-fprnd PPC options

gcc provides -mfprnd and -mno-fprnd for controlling the fprnd target
feature; support these options as well.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@178414 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index bd3f76d..a17b2a8 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -1029,8 +1029,8 @@
 bool PPCTargetInfo::setFeatureEnabled(llvm::StringMap<bool> &Features,
                                          StringRef Name,
                                          bool Enabled) const {
-  if (Name == "altivec" || Name == "mfocrf" || Name == "popcntd" ||
-      Name == "qpx") {
+  if (Name == "altivec" || Name == "fprnd" || Name == "mfocrf" ||
+      Name == "popcntd" || Name == "qpx") {
     Features[Name] = Enabled;
     return true;
   }