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Xin Zhao authored Mar 03, 2015 and Pavan Balaji committed Mar 04, 2015

Originally, do_accumulate_op() is used to perform the ACC
computation on target between data from origin side and
data on the target window. It requires that the target side
must first unpack the received origin data into the same data
layout as the target data before calling this function, which
may consume potentially large of memory.

This patch fixes do_accumulate_op() function in the following
aspects:

(1) It requires that the origin data passed to the function
must be "in a packed manner", which means it looks as if all
basic type elements in the origin data is placed one by one.
Note that the origin data is not necessarily contiguous, since
we may use non-contiguous basic type. If the basic type
is contiguous, then the origin data must be contiguous.

(2) It adds a new function argument, stream_offset, which
specifies a starting location in the target data. This allows
the origin data to work with partial of target data with stream
size.
Signed-off-by: Pavan Balaji <balaji@anl.gov>