NOTE: This is not the final form of how operand ownership restraints will be
represented. This patch is instead an incremental change that extracts out this
functionality from the ownership verifier as a pure refactor.
rdar://44667493
This does not eliminate the entrypoints on SILBuilder yet. I want to do this in
two parts so that it is functionally easier to disentangle changing the APIs
above SILBuilder and changing the underlying instruction itself.
rdar://33440767
I am doing this for two reasons:
1. I am going to use this in function signature opts to prove that a guaranteed
parameter is "consumed".
2. It puts the ownership verifier on a diet.
rdar://38196046
