Subzero: Fix the g++ build (e.g. Windows).

src/PNaClTranslator.cpp

Index: src/PNaClTranslator.cpp
diff --git a/src/PNaClTranslator.cpp b/src/PNaClTranslator.cpp
index 3f14ae028b3fedc639e3d42b9d33e7f0cc59c953..b74de0a999f908813535bfab8189e582ed05557f 100644
--- a/src/PNaClTranslator.cpp
+++ b/src/PNaClTranslator.cpp
@@ -1681,6 +1681,8 @@ private:
       Cond = Ice::InstIcmp::Sle;
       return true;
     default:
+      // Make sure Cond is always initialized.
+      Cond = static_cast<Ice::InstIcmp::ICond>(0);
       return false;
     }
   }
@@ -1739,6 +1741,8 @@ private:
       Cond = Ice::InstFcmp::True;
       return true;
     default:
+      // Make sure Cond is always initialized.
+      Cond = static_cast<Ice::InstFcmp::FCond>(0);
       return false;
     }
   }