Mark SVal constructors 'explicit'.

llvm-svn: 120970
diff --git a/clang/lib/Checker/GRState.cpp b/clang/lib/Checker/GRState.cpp
index e5653f8..3282664 100644
--- a/clang/lib/Checker/GRState.cpp
+++ b/clang/lib/Checker/GRState.cpp
@@ -247,7 +247,7 @@
   BasicValueFactory &BVF = svalBuilder.getBasicValueFactory();
   // FIXME: This should be using ValueManager::ArrayindexTy...somehow.
   QualType indexTy = Ctx.IntTy;
-  nonloc::ConcreteInt Min = BVF.getMinValue(indexTy);
+  nonloc::ConcreteInt Min(BVF.getMinValue(indexTy));
 
   // Adjust the index.
   SVal newIdx = svalBuilder.evalBinOpNN(this, BO_Add,