i#1551 port to ARM: predicated SIMD/FP, part 3: encoding dups
i#1551 port to ARM: predicated SIMD/FP, part 3: encoding dups

Adds skipping of duplicate encodings to the encoding chain generation
script.

SVN-Revision: 2927

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