erts: Add the type-testing guard BIF is_map/1

To add a type-testing guard BIF, the following steps are needed:

* The BIF itself is added to bif.tab (note that it should be declared
  using "ubif", not "bif"), and its implementation to erl_bif_op.c.

* erl_internal must be modified in 3 places: The type test must be
  recognized as guard BIF, as a type test, and it must be auto-imported.

* There must be an instruction that implements the same type test as
  the BIF (it will be used in guards). beam_utils:bif_to_test/3 must
  be updated to recognize the new guard BIF.

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