Fix symbol table handling in functions.

src/IceOperand.cpp

Index: src/IceOperand.cpp
diff --git a/src/IceOperand.cpp b/src/IceOperand.cpp
index b718ba50f445c15e801e3517d674022de3bf7e96..df4fb65397f4e49e365738ebca8e5cad8df231f0 100644
--- a/src/IceOperand.cpp
+++ b/src/IceOperand.cpp
@@ -188,6 +188,11 @@ IceString Variable::getName() const {
   return buf;
 }
 
+void Variable::setName(IceString &NewName) {
+  assert(Name.empty());

[Jim Stichnoth, 2014/09/10 18:44:23]

Document that the assert is to be sure true renamings aren't happening.

[Karl, 2014/09/10 21:14:33]

Done.

+  Name = NewName;
+}
+
 Variable Variable::asType(Type Ty) {
   Variable V(Ty, DefNode, Number, Name);
   V.RegNum = RegNum;