Matthew Dempsky: Attached patch replaces the type punning with memcpy(), which on
x86/x86-64 clang optimizes to direct word accesses anyway.  This fixes an unaligned word access in murmurhash/cityhash.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@185558 91177308-0d34-0410-b5e6-96231b3b80d8