Fix a ubsan failure introduced by r305092

lib/Object/WindowsResource.cpp:578:3: runtime error: store to
misaligned address 0x7fa09aedebbe for type 'unsigned int', which
requires 4 byte alignment
0x7fa09aedebbe: note: pointer points here
00 00 03 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00  00 00
            ^

llvm-svn: 305149