Fix MSVC build failure introduced in r291431

MSVC does not like to reinterpret_cast to a uint64_t. Use a different cast
instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291435 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed