[TableGen] Move a function from llvm namespace and make it a static function. NFC

It's only called from one place and is defined just above that use.

llvm-svn: 328074
diff --git a/llvm/utils/TableGen/CodeGenSchedule.cpp b/llvm/utils/TableGen/CodeGenSchedule.cpp
index 90d7c8e..09e41e7 100644
--- a/llvm/utils/TableGen/CodeGenSchedule.cpp
+++ b/llvm/utils/TableGen/CodeGenSchedule.cpp
@@ -431,10 +431,8 @@
   return false;
 }
 
-namespace llvm {
-
-void splitSchedReadWrites(const RecVec &RWDefs,
-                          RecVec &WriteDefs, RecVec &ReadDefs) {
+static void splitSchedReadWrites(const RecVec &RWDefs,
+                                 RecVec &WriteDefs, RecVec &ReadDefs) {
   for (Record *RWDef : RWDefs) {
     if (RWDef->isSubClassOf("SchedWrite"))
       WriteDefs.push_back(RWDef);
@@ -445,8 +443,6 @@
   }
 }
 
-} // end namespace llvm
-
 // Split the SchedReadWrites defs and call findRWs for each list.
 void CodeGenSchedModels::findRWs(const RecVec &RWDefs,
                                  IdxVec &Writes, IdxVec &Reads) const {