Use report_fatal_error before destroying input object on error.

src/IceCfgNode.cpp

Index: src/IceCfgNode.cpp
diff --git a/src/IceCfgNode.cpp b/src/IceCfgNode.cpp
index f69d3c1a5e22a632397e3d275e900505c92b74e1..87eee0f8a31ff5a53cc37b939a4ce3ae7f324d9a 100644
--- a/src/IceCfgNode.cpp
+++ b/src/IceCfgNode.cpp
@@ -809,8 +809,8 @@ void emitRegisterUsage(Ostream &Str, const Cfg *Func, const CfgNode *Node,
     // familiar order.
     std::sort(LiveRegs.begin(), LiveRegs.end(),
               [](const Variable *V1, const Variable *V2) {
-      return V1->getRegNum() < V2->getRegNum();
-    });
+                return V1->getRegNum() < V2->getRegNum();
+              });
     bool First = true;
     for (Variable *Var : LiveRegs) {
       if (!First)