[llvm-objcopy][MachO] Fix strict-aliasing warning. NFCI

Summary:
Use MachOObjectFile::isRelocationScattered instead of reinterpret_cast.

Fixes https://bugs.llvm.org/show_bug.cgi?id=42360

Reviewers: alexshap, rupprecht, jhenderson

Reviewed By: alexshap

Subscribers: dendibakh, bjope, uabelho, jakehehrlich, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D63699

llvm-svn: 364252
diff --git a/llvm/tools/llvm-objcopy/MachO/MachOReader.cpp b/llvm/tools/llvm-objcopy/MachO/MachOReader.cpp
index ce4bc2e..d312930 100644
--- a/llvm/tools/llvm-objcopy/MachO/MachOReader.cpp
+++ b/llvm/tools/llvm-objcopy/MachO/MachOReader.cpp
@@ -101,9 +101,7 @@
       RelocationInfo R;
       R.Symbol = nullptr; // We'll fill this field later.
       R.Info = MachOObj.getRelocation(RI->getRawDataRefImpl());
-      R.Scattered =
-          reinterpret_cast<MachO::scattered_relocation_info *>(&R.Info)
-              ->r_scattered;
+      R.Scattered = MachOObj.isRelocationScattered(R.Info);
       S.Relocations.push_back(R);
     }