extensive use of instruction attributes

Instead of using magic numbers, let us define a series of attributes
and use them from the VM core.  Proper function declarations makes
these attributes inlined in most modern compilers.  On my machine
exact same binary is generated with or without this changeset.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62085 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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