[analyzer] Specify the C++ standard in more tests.

Makes life easier for downstream developers with different default standard.

llvm-svn: 375308
diff --git a/clang/test/Analysis/cast-value-logic.cpp b/clang/test/Analysis/cast-value-logic.cpp
index 221ae7f..1411ede 100644
--- a/clang/test/Analysis/cast-value-logic.cpp
+++ b/clang/test/Analysis/cast-value-logic.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_analyze_cc1 \
+// RUN: %clang_analyze_cc1 -std=c++14 \
 // RUN:  -analyzer-checker=core,apiModeling.llvm.CastValue,debug.ExprInspection\
 // RUN:  -verify %s