Wrap the boost::small_vectors in STFRecordMap inside their own class so

that the single-element optimization is handled properly
    - Fixes segfault in stf_dump when dumping PTEs

Fix segfault in STFInstReader when ignoring records
Flag faulting instructions in STFInstReader
Add vector register definitions and formatter
Fix assertion message in Registers::formatVector_
Add explicit copy assignment operator to STFRegState to fix compile errors on OSX
Fix duplicated EVENT_PC_TARGET records in stf_extract