STOP: optimize size of stop images

1) optimize scom with no rc and directly inline asm(saved for 2K :D)
2) initialize all variables(doesnt really save size, just good guideline)
3) loop both cores when block is big and redundant(saved only 50B -_-)
   (50b for 3 blocks, each block saves 17b, or 4 instructions)
4) improvement on history update(saved 500B more :))
5) functionalize the exit catchup routine which is identical twice
   (this back fired and cost us 100B :()
6) functionalize the eval eimr override macro which is identical twice
   (saved 130B :|)
7) finally the saving is about 2728B on CME
8) apply history update tech to sgpe, found bug in the tech, fixed
   (but our saving is back to ~2500B)
9) clean up sgpe redundent ex branching code
   (same as cme saved only about ~60B)
10) rebase

Change-Id: Id94e5d8b0e51868bc058723c279b590f01e7fc71
Original-Change-Id: I3664d6a2dcab85f896a583852afde948e635bd02
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/34777
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Reviewed-by: AMIT KUMAR <akumar3@us.ibm.com>
Reviewed-by: Gregory S. Still <stillgs@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>