move tier out of an anonymous namespace, it doesn't make sense
to for it to be an an anon namespace and be in a header.

Eliminate some extraenous uses of tie.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135669 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/CodeGenInstruction.cpp b/utils/TableGen/CodeGenInstruction.cpp
index a52ce86c..86a377b 100644
--- a/utils/TableGen/CodeGenInstruction.cpp
+++ b/utils/TableGen/CodeGenInstruction.cpp
@@ -267,8 +267,9 @@
 
 void CGIOperandList::ProcessDisableEncoding(std::string DisableEncoding) {
   while (1) {
-    std::string OpName;
-    tie(OpName, DisableEncoding) = getToken(DisableEncoding, " ,\t");
+    std::pair<StringRef, StringRef> P = getToken(DisableEncoding, " ,\t");
+    std::string OpName = P.first;
+    DisableEncoding = P.second;
     if (OpName.empty()) break;
 
     // Figure out which operand this is.