HPL_bcast Perform the row broadcast.
broadcasts the current panel. Successful completion is
indicated by IFLAG set to HPL_SUCCESS on return. IFLAG will be set to
HPL_FAILURE on failure and to HPL_KEEP_TESTING when the operation was
not completed, in which case this function should be called again.
PANEL (input/output) HPL_T_panel *
On entry, PANEL points to the current panel data structure
IFLAG (output) int *
On exit, IFLAG indicates whether or not the broadcast has