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Prior to this change, the assembly code to invoke p9 attentions did not
flush the instruction cache, which led to the alternative behavior of the
attn instruction, namely invoking the hypervisor emulation assistance
interrupt / illegal instruction handler. This caused chaos in the shutdown
path, especially after the CPUs come online in istep 16.
Change-Id: I7c5bf4342a41136e82326da285eed059d4fb17a3
CQ: SW419736
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/61351
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
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