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

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@364252 91177308-0d34-0410-b5e6-96231b3b80d8

GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm