delete tool/instruction.rb (2nd try)

Previous commit changed insns.def format. Now is the time for its
generators. In doing so I chose to modernize the system, not just
patch.  My attempt includes

- extensive use of Onigumo regular expressions
- split from one big file (instruction.rb) into separated MVC
- partial view

Also, let me take this opportunity to kill old unused features
such as

- stack caching
- minsns / yasmdata which are never seriously used
- yarvarch document generation (moved to doc/)
- vast majority of unused arguments to insns2vm.rb

This commit generates VM source codes that cleanly compile, and
the generated binary passes tests.  At least for me.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61784 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

tool/ruby_vm/models/instructions_unifications.rb

@@ -0,0 +1,43 @@
+#! /your/favourite/path/to/ruby
+# -*- mode: ruby; coding: utf-8; indent-tabs-mode: nil; ruby-indent-level: 2 -*-
+# -*- frozen_string_literal: true; -*-
+# -*- warn_indent: true; -*-
+#
+# Copyright (c) 2017 Urabe, Shyouhei.  All rights reserved.
+#
+# This file is  a part of the programming language  Ruby.  Permission is hereby
+# granted, to  either redistribute and/or  modify this file, provided  that the
+# conditions  mentioned in  the file  COPYING are  met.  Consult  the file  for
+# details.
+
+require_relative '../helpers/c_escape'
+require_relative '../loaders/opt_insn_unif_def'
+require_relative 'bare_instructions'
+
+class RubyVM::InstructionsUnifications
+  include RubyVM::CEscape
+
+  attr_reader :name
+
+  def initialize location:, signature:
+    @location = location
+    @name     = namegen signature
+    @series   = signature.map do |i|
+      RubyVM::BareInstructions.fetch i # Misshit is fatal
+    end
+  end
+
+  private
+
+  def namegen signature
+    as_tr_cpp ['UNIFIED', *signature].join('_')
+  end
+
+  @instances = RubyVM::OptInsnUnifDef.map do |h|
+    new(**h)
+  end
+
+  def self.to_a
+    @instances
+  end
+end