trying to fix the windows build broken by r267496

llvm-svn: 267513
diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
index 9170d58..dcea1a5 100644
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -6724,7 +6724,7 @@
   }
 
   // Compute the byval alignment.
-  constexpr unsigned MinABIStackAlignInBytes = 4;
+  const unsigned MinABIStackAlignInBytes = 4;
   unsigned TypeAlign = getContext().getTypeAlign(Ty) / 8;
   return ABIArgInfo::getIndirect(CharUnits::fromQuantity(4), /*ByVal=*/true,
                                  /*Realign=*/TypeAlign >