Subzero: Don't store std::string objects inside Variable.

src/IceConverter.cpp

Index: src/IceConverter.cpp
diff --git a/src/IceConverter.cpp b/src/IceConverter.cpp
index a8148f97ad1f7bd3333b07435ac4e5cd2e64c463..9e003ef8b68edc215aad5cf9248622ea9165aa4f 100644
--- a/src/IceConverter.cpp
+++ b/src/IceConverter.cpp
@@ -145,7 +145,9 @@ private:
     if (IceTy == Ice::IceType_void)
       return nullptr;
     if (VarMap.find(V) == VarMap.end()) {
-      VarMap[V] = Func->makeVariable(IceTy, V->getName());
+      VarMap[V] = Func->makeVariable(IceTy);
+      if (ALLOW_DUMP)
+        VarMap[V]->setName(Func, V->getName());
     }
     return VarMap[V];
   }