[MachOYAML] Use a temporary to avoid gcc strict-aliasing warning

GCC complains about this with -Wstrict-aliasing. Using a temporary here should prevent the warning.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273627 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed