Ensuring the bit-fields have the same type; MSVC will place the fields in different allocation units otherwise.

llvm-svn: 274654
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index bd965c7..c1b7d47 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -8892,7 +8892,7 @@
     struct Value {
       explicit Value(unsigned Parent) : Parent(Parent), Merged(false) {}
       unsigned Parent : 31;
-      bool Merged : 1;
+      unsigned Merged : 1;
     };
     SmallVector<Value, 8> Values;