[semantic-arc-opts] Change Semantic ARC Opts to run only on the stdlib so it only sees ownership verified SIL.

The reason why I am doing this is now that once we have the
OperandOwnershipKindMap I can write this optimization in a more robust,
aggressive manner. My hope is that I can eliminate all copy_value of guaranteed
parameters all of whose uses could accept a guaranteed parameter. This is given
to me by the OperandOwnershipKindMap.

Additionally, I found that the way the analysis was using the OwnershipVerifier
was not sound on non-ownership verified SIL. Rather than fix it, I just turned
it off for that case.

rdar://44667493

lib/SIL/SILModule.cpp

@@ -660,6 +660,10 @@ void SILModule::setOptRecordStream(
   OptRecordRawStream = std::move(RawStream);
 }
 
+bool SILModule::isStdlibModule() const {
+  return TheSwiftModule->isStdlibModule();
+}
+
 SILProperty *SILProperty::create(SILModule &M,
                                  bool Serialized,
                                  AbstractStorageDecl *Decl,