Implement prefetch_read_{many,once}() for sparc64 and fix compilation on other !x86 architectures.
Implement prefetch_read_{many,once}() for sparc64 and fix compilation on
other !x86 architectures.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase