[gardening] Add more comprehensive comments to SILSuccessor.h.
[gardening] Add more comprehensive comments to SILSuccessor.h.

This just makes it clearer what this class really does and also makes it clear
that this is really representing a CFGEdge more than a specific successor. I may
rename it to SILCFGEdge at some point to make the name match its usage.

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omni/swift,djwbrown/swift,nathawes/swift,ahoppen/swift,brentdax/swift,gribozavr/swift,danielmartin/swift,arvedviehweger/swift,jopamer/swift,alblue/swift,hughbe/swift,parkera/swift,milseman/swift,alblue/swift,uasys/swift,aschwaighofer/swift,felix91gr/swift,gribozavr/swift,gregomni/swift,natecook1000/swift,huonw/swift,alblue/swift,parkera/swift,jopamer/swift,frootloops/swift,natecook1000/swift,Jnosh/swift,apple/swift,djwbrown/swift,shahmishal/swift,jtbandes/swift,gribozavr/swift,jckarter/swift,glessard/swift,natecook1000/swift,jtbandes/swift,atrick/swift,devincoughlin/swift,ahoppen/swift,jckarter/swift,calebd/swift,karwa/swift,allevato/swift,allevato/swift,shahmishal/swift,arvedviehweger/swift,nathawes/swift,arvedviehweger/swift,devincoughlin/swift,return/swift,deyton/swift,harlanhaskins/swift,jmgc/swift,austinzheng/swift,huonw/swift