cpu-o3: fix data pkt initialization for split load
cpu-o3: fix data pkt initialization for split load

When a split load hits a memory region where IPRs are mapped, the
Writebackevent which is scheduled for that was carrying a data packet
that was not correctly initialized which caused an assertion to fire
when the Writeback event is processed.

Change-Id: I71a4e291f0086f7468d7e8124a0a8f098088972f
Signed-off-by: Matthias Hille <5c698518b9453ae126dd90f788fa64d6d7b967f1@gmail.com>
Reported-by: Matthias Hille <5c698518b9453ae126dd90f788fa64d6d7b967f1@gmail.com>
Reviewed-on: https://gem5-review.googlesource.com/4620
Reviewed-by: Andreas Sandberg <c9f5686ee5bd561c93f9de79681eee75bfa7f36e@arm.com>
Reviewed-by: Gabe Black <5c8aa1266c03186393d9e7b3b4e3b14239af8201@google.com>
Maintainer: Andreas Sandberg <c9f5686ee5bd561c93f9de79681eee75bfa7f36e@arm.com>

TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,gem5/gem5,sobercoder/gem5,sobercoder/gem5,TUD-OS/gem5-dtu,sobercoder/gem5,sobercoder/gem5,sobercoder/gem5,gem5/gem5,gem5/gem5,gem5/gem5,sobercoder/gem5,gem5/gem5,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,gem5/gem5,sobercoder/gem5,gem5/gem5