Use finer grained on-the-fly helper computations for EC.
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Use finer grained on-the-fly helper computations for EC.

* src/ec-context.h (mpi_ec_ctx_s): Replace NEED_SYNC by a bitfield.
* mpi/ec.c (ec_p_sync): Remove.
(ec_get_reset, ec_get_a_is_pminus3, ec_get_two_inv_p): New.
(ec_p_init): Use ec_get_reset.
(_gcry_mpi_ec_set_mpi, _gcry_mpi_ec_dup_point)
(_gcry_mpi_ec_add_points): Replace ec_p_sync by the ec_get_ accessors.