[APSInt] Add a static_assert to ensure APSInt is packed well with APInt after r300171.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300213 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/ADT/APSInt.h b/include/llvm/ADT/APSInt.h
index 813b3686d6b1ae6efff88adcbb136ff32fca2115..865af2db2a03f414c6156d60cc3259ade3926f31 100644 (file)
--- a/include/llvm/ADT/APSInt.h
+++ b/include/llvm/ADT/APSInt.h
@@ -24,7 +24,9 @@ class LLVM_NODISCARD APSInt : public APInt {
 
 public:
   /// Default constructor that creates an uninitialized APInt.
-  explicit APSInt() : IsUnsigned(false) {}
+  explicit APSInt() : IsUnsigned(false) {
+    static_assert(sizeof(*this) == 16, "APSInt fields poorly packed");
+  }
 
   /// APSInt ctor - Create an APSInt with the specified width, default to
   /// unsigned.