Re: TAGs for variables created through common.opt

[Aldy Hernandez <aldyh at redhat dot com>]

Well, whadayaknow... Tom Tromey pointed me at --regex which we can use 
to add patterns for not only the .opt files, but for a bunch of other 
files/languages we define in GCC.

The following patch adds support for common.opt, rtl.def, tree.def, and 
gimple.def.  Now you can use your editor to tag things like GIMPLE_NOP, 
and PLUS_EXPR, which means I'll get lost less often.

Kinda neat, IMO.

Tested by inspecting TAGS.sub manually, as well as searching for random 
stuff with both vi and emacs.

OK for mainline?

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