Build OpCode analyzer

[Scooletz]

Build an analyzer that walks through the opcodes of the given contract and analyzes it and finds chunks of opcodes that match a sequence that is ILed and known to be optimized. That would result in creation of ILInfo for the given byte code.

The decision whether or when the given CodeInfo should be a subject of analysis would be left for later.

Plan of Action

• create IlInfo component that is constructed from the byte code
• make IlInfo dense and small, for example (ushort[] pcs, byte[] iledMethods) for storing all the data
• add HasOverride(int pc) and the delegating method
• the analysis, it would be great if it was fast and single pass. We could consider storing sequences of opcodes that are optimized in a Trie or other approach that would allow to track multiple sequences (starting from PC_i it can be one sequence, but PC_i+1 can start another one) etc. Still in the initial phase, as the analysis will be done asynchronously, we can make it work first and then optimize