[MachO] Fix unaligned load in extractSections

[thurstond]

A recent change to ubsan
(llvm@7926744)
exposed an unaligned load in MachOReader (see
https://lab.llvm.org/buildbot/#/builders/85/builds/19482 for an example).

This patch fixes it by dropping the alignment.

[github-actions]

⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

You can test this locally with the following command:

git-clang-format --diff 97b989b27496d5aeadb3b90cbb9305ddcd9e35d2 b37687344d667b0ac71f7d80e19c48e0629fc221 -- llvm/lib/ObjCopy/MachO/MachOReader.cpp

View the diff from clang-format here.

diff --git a/llvm/lib/ObjCopy/MachO/MachOReader.cpp b/llvm/lib/ObjCopy/MachO/MachOReader.cpp
index 9006f9e6d..25f8c020c 100644
--- a/llvm/lib/ObjCopy/MachO/MachOReader.cpp
+++ b/llvm/lib/ObjCopy/MachO/MachOReader.cpp
@@ -67,7 +67,8 @@ Expected<std::vector<std::unique_ptr<Section>>> static extractSections(
                                                         LoadCmd.C.cmdsize);
        Curr < End; ++Curr) {
     SectionType Sec;
-    memcpy((void *)&Sec, reinterpret_cast<const char*>(Curr), sizeof(SectionType));
+    memcpy((void *)&Sec, reinterpret_cast<const char *>(Curr),
+           sizeof(SectionType));
 
     if (MachOObj.isLittleEndian() != sys::IsLittleEndianHost)
       MachO::swapStruct(Sec);