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847 or1200_genpc: fix ipcu_cycstb_o generation

In some circumstances the CPU is still waiting for the lsu to finish
while in a pre branch state. However, ipcu_cycstb_o is set and the cycle
starts with the wrong address on the iwb bus (the one before the
branched address).

This fixes this issue.

Patch by: Franck Jullien <franck.jullien@gmail.com>
stekern 4270d 06h /openrisc
846 or1200: Fix for cache bug related to first_{hit|miss}_ack

Under certain circumstances, when first_hit_ack and
first_miss_ack is asserted at the same time, cache data
would wrongly be overwritten with bus data.

Patch by: Matthew Hicks <firefalcon@gmail.com>
stekern 4270d 06h /openrisc
845 or1200: l.lws support

Using the l.lws instruction doesn't work currently.
It simply skips the instruction. No exception or reaction.
The patch attached simply duplicates the behaviour of
l.lwz for l.lws.

Patch by: Jeppe Græsdal Johansen <jjohan07@student.aau.dk>
stekern 4270d 06h /openrisc
844 skrzyp 4271d 00h /openrisc
843 Applied RDiez suggestions skrzyp 4271d 00h /openrisc
842 Moving GDB 7.1 into the old collection. jeremybennett 4272d 22h /openrisc
841 GDB 7.2 is now considered the stable version. jeremybennett 4272d 22h /openrisc
840 Relocate GDB 6.8 to the old directory. jeremybennett 4272d 22h /openrisc
839 Forgot about updating linker flags, thanks RDiez! skrzyp 4274d 01h /openrisc
838 added branch-delay option and sets r0 to zero skrzyp 4274d 14h /openrisc

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