Support cross-vm code generation (converts irep in scope_finish)
Merge branch 'master' into feature/cross-vm
Add converter for Nios2
Add relative jump fixing for nios2
Modify binary file headers
Add codedump for Nios2
Replace array access with genop
Remove unused variable
Merge branch 'master' into feature/vm-nios2
Add toolchain for nios2 and cross compile settings
Add MRB_MACHINE_NIOS2 mode (cannot run now...)
Move STACK_REG etc.. to vm_nios2.h
Add simple implement or mrb_run of Nios2 VM
Add MRB_MACHINE_NAME
Move mrb_machine from compile.h to mruby.h
Add options for Nios2/e
Move mrb_set_machine
Fix jump offset and add OP_ARYCAT
Modify rite_binary loader for supporting another VM
Refactoring of jump offset