Fix handling of relocation names, so that prefix mangling works.

src/IceOperand.cpp

Index: src/IceOperand.cpp
diff --git a/src/IceOperand.cpp b/src/IceOperand.cpp
index 3285e6d78a06b97614d71769ce5d3fdd21c992ec..98e8f6f1f9e5978bd9435663f14b463ca36d930e 100644
--- a/src/IceOperand.cpp
+++ b/src/IceOperand.cpp
@@ -460,8 +460,13 @@ void ConstantRelocatable::emit(GlobalContext *Ctx) const {
   }
 }
 
-void ConstantRelocatable::dump(const Cfg *, Ostream &Str) const {
-  Str << "@" << Name;
+void ConstantRelocatable::dump(const Cfg *Func, Ostream &Str) const {
+  Str << "@";
+  if (Func && !SuppressMangling) {
+    Str << Func->getContext()->mangleName(Name);
+  } else {
+    Str << Name;
+  }
   if (Offset)
     Str << "+" << Offset;
 }