Fix use of constexpr std::pair that's not in C++11.

llvm-svn: 258749
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index d1682e2..10547a4 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -2636,7 +2636,7 @@
   Address CheckKindAddr(V, getIntAlign());
   llvm::Value *CheckKind = Builder.CreateLoad(CheckKindAddr);
 
-  constexpr std::pair<int, SanitizerMask> CheckKinds[] = {
+  const std::pair<int, SanitizerMask> CheckKinds[] = {
       {CFITCK_VCall, SanitizerKind::CFIVCall},
       {CFITCK_NVCall, SanitizerKind::CFINVCall},
       {CFITCK_DerivedCast, SanitizerKind::CFIDerivedCast},