[1/7] Preprocessor cleanup

[Nathan Sidwell]

This is patch 1 of 7 from the modules branch, cleaning up random 
preprocessor stuff I fell over.

The directive table has some historical frequency data, which was 
relevant when we used to have to do a lookup for the directives.  Now 
the data hangs directly off the identifier node.

A minor indentation error fixed too.

Applying to trunk.

nathan

-- 
Nathan Sidwell
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