Conditionally expand the size_invs lookup table in arena_run_reg_dalloc() so that architectures with a quantum of 8 (rather than 16) work.
Conditionally expand the size_invs lookup table in arena_run_reg_dalloc()
so that architectures with a quantum of 8 (rather than 16) work.

Restore arm's quantum to 8.

Submitted by:	jmg

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