Disable two of the serialization tests.
We have a few serialization bugs, inconsistent rules and ugly workarounds. We
are planning to get this right as part of the work on resilience. Until we nail
down the serialization rules and fix the implementation I am disabling two tests
that prevent us from moving forward with the work on the optimization pipeline.
The plan is to enable SIL verifications as soon as possible.
rdar://23805004
