* vm.c (VM_COLLECT_USAGE_DETAILS): make new VM usage analysis

  hooks (old macro name is COLLECT_USAGE_ANALYSIS).
  This feature is only for VM developers.  (I'm not sure I can use
  `VM developers' (the plural form) in this sentence).
  If VM_COLLECT_USAGE_DETAILS is not 0, VM enables the following
  usage collection features:
  (1) insntruction: collect intruction usages.
  (2) operand: collect operand usages.
  (3) register: collect register usages.
  The results are stored in
  RubyVM::USAGE_ANALYSIS_INSN for (1, 2),
  RubyVM::USAGE_ANALYSIS_INSN_BIGRAM for (1) and
  RubyVM::USAGE_ANALYSIS_REGS for (3).
  You can stop collecting usages with
  RubyVM::USAGE_ANALYSIS_INSN_STOP(),
  RubyVM::USAGE_ANALYSIS_OPERAND_STOP(),
  RubyVM::USAGE_ANALYSIS_REGISTER_STOP()
  for (1), (2), (3) respectively.
  You can also change the hook functions by setting
  C level global variables
  `ruby_vm_collect_usage_func_(insn|operand|register)'
  for (1), (2), (3) respectively.
  See codes for more details.
* tool/instruction.rb: fix macro names.
* iseq.c (insn_operand_intern): make it export (used in vm.c).
  fix to skip several processes if not needed (pointer is 0).
* vm_dump.c: move codes for collection features to vm.c.
* vm_exec.h: rename macro and function names.
* vm_insnhelper.h: ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37085 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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