`FullExceptions` vs `TracedException`

[OlivierBBB]

We need two Exceptions objects:

• the "full" exceptions object that records all exceptions happening for a given instruction
• the "traced" exceptions object that records the exception which we wish to act upon

The TracedException will be used in the tracing of the stack-rows. We must have the property that

• TracedException is always pure (i.e. a single power of 2 or zero i.e. it's a short with at most one nonzero binary digit)
• TracedException = 0 <=> FullExceptions = 0
• If TracedException = (1 << k) then the k-th bit of FullExceptions is 1

Also the Gas.java should be using the TracedException to determine the outOfGasException flag.

---

Example of what we would like to achieve for the CallSection, for instance:

    // STATICX cases
    if (Exceptions.staticFault(exceptions)) {
      this.commonValues.tracedException == Exceptions.STATIC_FAULT;
      return;
    }

    // ...

    // MXPX case
    if (Exceptions.memoryExpansionException(exceptions)) {
      this.commonValues.tracedException == Exceptions.MEMORY_EXPANSION_EXCEPTION;
      return;
    }

    // ...

    // OOGX case
    if (Exceptions.outOfGasException(exceptions)) {
      this.commonValues.tracedException == Exceptions.OUT_OF_GAS_EXCEPTION;
      this.oogXCall(hub);
      return;
    }

The end goal is to replace exceptions below with tracedExceptions in the tracing of StackFragmet.java

        // Exception flag // this is WRONG
        .pStackOpcx(Exceptions.invalidCodePrefix(exceptions))
        .pStackSux(Exceptions.stackUnderflow(exceptions))
        .pStackSox(Exceptions.stackOverflow(exceptions))
        .pStackMxpx(Exceptions.memoryExpansionException(exceptions))
        .pStackOogx(Exceptions.outOfGasException(exceptions))
        .pStackRdcx(Exceptions.returnDataCopyFault(exceptions))
        .pStackJumpx(Exceptions.jumpFault(exceptions))
        .pStackStaticx(Exceptions.staticFault(exceptions))
        .pStackSstorex(Exceptions.outOfSStore(exceptions))
        .pStackIcpx(contextExceptions.invalidCodePrefix())
        .pStackMaxcsx(contextExceptions.codeSizeOverflow())

[letypequividelespoubelles]

duplicate of #922

[OlivierBBB]

TracedException could alternatively be an enum, which would be cleaner.