i#1551 port to ARM: fix decoding rule errors
i#1551 port to ARM: fix decoding rule errors

Fixes two table index computation errors

SVN-Revision: 2969

daksunt/dynamorio,AmesianX/dynamorio,sigma-random/dynamorio,daksunt/dynamorio,sigma-random/dynamorio,bl4ckic3/dynamorio,code4bones/dynamorio,daksunt/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,bl4ckic3/dynamorio,code4bones/dynamorio,code4bones/dynamorio,sigma-random/dynamorio,daksunt/dynamorio,sigma-random/dynamorio,bl4ckic3/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,daksunt/dynamorio,code4bones/dynamorio,bl4ckic3/dynamorio,bl4ckic3/dynamorio,sigma-random/dynamorio