Add a new semantics attribute to disable SIL verification on a function

This provides a way to disable verification per function instead of the entire module.

lib/SIL/Verifier/SILOwnershipVerifier.cpp

@@ -20,6 +20,7 @@
 #include "swift/AST/Decl.h"
 #include "swift/AST/GenericEnvironment.h"
 #include "swift/AST/Module.h"
+#include "swift/AST/SemanticAttrs.h"
 #include "swift/AST/Types.h"
 #include "swift/Basic/Assertions.h"
 #include "swift/Basic/Range.h"
@@ -866,6 +867,14 @@ void SILInstruction::verifyOperandOwnership(
     return;
 #endif
 
+  if (getModule().getOptions().VerifyNone) {
+    return;
+  }
+
+  if (getFunction()->hasSemanticsAttr(semantics::NO_SIL_VERIFICATION)) {
+    return;
+  }
+
   // If SILOwnership is not enabled, do not perform verification.
   if (!getModule().getOptions().VerifySILOwnership)
     return;