get_execution_seed returns a size_t which varies across platforms, but its
users actually always feed it into a uint64_t role so it makes sense to be
consistent.
Mostly this is just a tidy-up, but it also apparently allows PCH files to be
shared between Clang compilers built for 32-bit and 64-bit hosts.
llvm-svn: 341113
it with memcpy. This also fixes a problem on big-endian hosts, where
addUnaligned would return different results depending on the alignment
of the data.
llvm-svn: 151247
