i#1621 AArch64 CC opt: Use consecutive slots to save/restore regs. (#2496)
i#1621 AArch64 CC opt: Use consecutive slots to save/restore regs. (#2496)

By tightly packing the saved registers on the stack, we can reduce the
clean call stack size, which should be done in a follow-up commit.
AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio