add new rtl vm

add new rtl vm

* libguile/vm-engine.c (rtl_vm_engine): Add new VM.
  (vm_engine): Add support for calling RTL programs.

* libguile/tags.h (scm_tc7_rtl_program): New type for procedures that
  run on the new VM.
* libguile/evalext.c (scm_self_evaluating_p):
* libguile/goops.c (scm_class_of):
* libguile/print.c (iprin1):
* libguile/procprop.c (scm_i_procedure_arity):
* libguile/procs.c (scm_procedure_p): Add hooks for the new tc7.

* libguile/programs.h:
* libguile/programs.c (scm_make_rtl_program, scm_i_rtl_program_print)
  (scm_rtl_program_p, scm_rtl_program_code):
* module/system/vm/program.scm: Add constructors and accessors for the
  new "RTL programs".

* libguile/vm.c (rtl_boot_continuation): Define a boot program.
  (rtl_apply, rtl_values): New static RTL programs.

* libguile/frames.c (scm_frame_num_locals): Adapt for frames of RTL
  programs.

* libguile/frames.h: Add description of RTL frames.

* libguile/Makefile.am: Add rules to generate vm-operations.h.
* .gitignore: Ignore vm-operations.h.
* module/system/vm/instruction.scm:
* libguile/instructions.c:
* libguile/instructions.h: Use vm-operations.h to define enumerated
  values for the new RTL opcodes.  Define some helper macros to pack and
  unpack 32-bit instruction words.
  (rtl-instruction-list): New function, exported by (system vm
  instruction).

* libguile/objcodes.c: Wire up the bits needed to detect the new RTL
  bytecode and load it, as appropriate.