* vm_core.h: remove lfp (local frame pointer) and rename

  dfp (dynamic frame pointer) to ep (environment pointer).
  This change make VM `normal' (similar to other interpreters).
  Before this commit:
  Each frame has two env pointers lfp and dfp.  lfp points
  local environment which is method/class/toplevel frame.
  lfp[0] is block pointer.
  dfp is block local frame. dfp[0] points previous (parent)
  environment pointer.
  lfp == dfp when frame is method/class/toplevel.
  You can get lfp from dfp by traversing previous environment
  pointers.
  After this commit:
  Each frame has only `ep' to point respective enviornoment.
  If there is parent environment, then ep[0] points parent
  envioenment (as dfp).  If there are no more environment,
  then ep[0] points block pointer (as lfp).  We call such ep
  as `LEP' (local EP).  We add some macros to get LEP and to
  detect LEP or not.
  In short, we replace dfp and lfp with ep and LEP.
  rb_block_t and rb_binding_t member `lfp' and `dfp' are removed
  and member `ep' is added.
  rename rb_thread_t's member `local_lfp' and `local_svar' to
  `root_lep' and `root_svar'.
  (VM_EP_PREV_EP(ep)): get previous environment pointer.  This macro
  assume that ep is not LEP.
  (VM_EP_BLOCK_PTR(ep)): get block pointer.  This macro assume
  that ep is LEP.
  (VM_EP_LEP_P(ep)): detect ep is LEP or not.
  (VM_ENVVAL_BLOCK_PTR(ptr)): make block pointer.
  (VM_ENVVAL_BLOCK_PTR_P(v)): detect v is block pointer.
  (VM_ENVVAL_PREV_EP_PTR(ptr)): make prev environment pointer.
  (VM_ENVVAL_PREV_EP_PTR_P(v)): detect v is prev env pointer.
* vm.c: apply above changes.
  (VM_EP_LEP(ep)): get LEP.
  (VM_CF_LEP(cfp)): get LEP of cfp->ep.
  (VM_CF_PREV_EP(cfp)): utility function VM_EP_PREV_EP(cfp->ep).
  (VM_CF_BLOCK_PTR(cfp)): utility function VM_EP_BLOCK_PTR(cfp->ep).
* vm.c, vm_eval.c, vm_insnhelper.c, vm_insnhelper.h, insns.def:
  apply above changes.
* cont.c: ditto.
* eval.c, eval_intern.h: ditto.
* proc.c: ditto.
* thread.c: ditto.
* vm_dump.c: ditto.
* vm_exec.h: fix function name (on vm debug mode).



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36030 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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