start with block_compiler

as a copy of method_compiler
re-merge later, when we know what's needed

lib/risc/block_compiler.rb

@@ -0,0 +1,21 @@
+module Risc
+
+  # A BlockCompiler is much like a Mehtodcompiler, exept for blocks
+  #
+  class BlockCompiler
+
+    attr_reader :block , :risc_instructions , :constants
+
+    def initialize( block , method)
+      @method = method
+      @regs = []
+      @block = block
+      name = "#{method.self_type.name}.init"
+      @risc_instructions = Risc.label(name, name)
+      @risc_instructions << Risc.label( name, "unreachable")
+      @current = @risc_instructions
+      @constants = []
+    end
+
+  end
+end