erts: Refactor BIF tracing

This commit replaces our current BIF-specific tracing functionality
with the general function/export tracing used for everything else,
fixing a few longstanding issues:

 * BIFs that trapped to themselves, for example lists:reverse/2,
   would generate a call trace message for each trap but only a
   single return trace message.
 * BIFs that trapped elsewhere, like erlang:delete_module/1, would
   lose their return trace messages altogether.
 * Return/exception trace messages on tail calls would point at the
   function "above" the caller.
 * Call count tracing simply didn't work.

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