Only annotate forms when linting in the compiler

A lot of time spent on linting is due to eval_file_attribute/2
function that recursively traverses all the AST, annotating
the file name on the AST nodes. This traversal happens so
it is easier to add errors and warnings later on by simply
introspecting the node.

This patch changes eval_file_attribute/2 to only annotate
forms (i.e. attributes and functions) and rely on the #lint
record to keep the proper file information (which it already
did before this patch).

To summarize, both pre scan and pos scan will use the annotated
file attribute in forms, however form/2 already maintains the
proper file in #lint, which we pass around when retrieving the
location information.

After this patch, linting of a regular erlang module with 500LOC
became twice faster when measured with eprof.

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