fix build on systems where uint64_t != unsigned long long


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64605 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index f724524..9659b94 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -377,7 +377,7 @@
     // FIXME: This isn't precisely correct; the width/alignment should depend
     // on the available types for the target
     Width = cast<FixedWidthIntType>(T)->getWidth();
-    Width = std::max(llvm::NextPowerOf2(Width - 1), 8ULL);
+    Width = std::max(llvm::NextPowerOf2(Width - 1), (uint64_t)8);
     Align = Width;
     break;
   case Type::ASQual: