Fix MSVC "result of 32-bit shift implicitly converted to 64 bits" warning. NFCI.

llvm-svn: 369366
diff --git a/llvm/tools/llvm-objcopy/MachO/MachOLayoutBuilder.cpp b/llvm/tools/llvm-objcopy/MachO/MachOLayoutBuilder.cpp
index 9f4e4fc..ede34d0 100644
--- a/llvm/tools/llvm-objcopy/MachO/MachOLayoutBuilder.cpp
+++ b/llvm/tools/llvm-objcopy/MachO/MachOLayoutBuilder.cpp
@@ -144,7 +144,8 @@
         if (Sec.isVirtualSection()) {
           Sec.Offset = 0;
         } else {
-          uint64_t PaddingSize = OffsetToAlignment(SegFileSize, 1 << Sec.Align);
+          uint64_t PaddingSize =
+              OffsetToAlignment(SegFileSize, 1ull << Sec.Align);
           Sec.Offset = SegOffset + SegFileSize + PaddingSize;
           Sec.Size = Sec.Content.size();
           SegFileSize += PaddingSize + Sec.Size;