AST: Use a builtin conformance for unconditional Copyable/Escapable

This generalizes what we were already doing for classes.

lib/AST/ConformanceLookup.cpp

@@ -29,7 +29,6 @@
 #include "swift/AST/DiagnosticsSema.h"
 #include "swift/AST/ExistentialLayout.h"
 #include "swift/AST/GenericEnvironment.h"
-#include "swift/AST/InverseMarking.h"
 #include "swift/AST/NameLookup.h"
 #include "swift/AST/NameLookupRequests.h"
 #include "swift/AST/PackConformance.h"
@@ -403,39 +402,6 @@ static ProtocolConformanceRef getBuiltinMetaTypeTypeConformance(
   return ProtocolConformanceRef::forMissingOrInvalid(type, protocol);
 }
 
-static ProtocolConformanceRef
-getBuiltinInvertibleProtocolConformance(NominalTypeDecl *nominal,
-                                        Type type,
-                                        ProtocolDecl *protocol) {
-  assert(isa<ClassDecl>(nominal));
-  ASTContext &ctx = protocol->getASTContext();
-
-  auto ip = protocol->getInvertibleProtocolKind();
-  switch (*ip) {
-  case InvertibleProtocolKind::Copyable:
-    // If move-only classes is enabled, we'll check the markings.
-    if (ctx.LangOpts.hasFeature(Feature::MoveOnlyClasses)) {
-      switch (nominal->hasInverseMarking(*ip).getKind()) {
-      case InverseMarking::Kind::LegacyExplicit:
-      case InverseMarking::Kind::Explicit:
-        // An inverse ~Copyable prevents conformance.
-        return ProtocolConformanceRef::forInvalid();
-
-      case InverseMarking::Kind::None:
-        break;
-      }
-    }
-    break;
-  case InvertibleProtocolKind::Escapable:
-    // Always conforms.
-    break;
-  }
-
-  return ProtocolConformanceRef(
-      ctx.getBuiltinConformance(type, protocol,
-                                BuiltinConformanceKind::Synthesized));
-}
-
 /// Synthesize a builtin type conformance to the given protocol, if
 /// appropriate.
 static ProtocolConformanceRef
@@ -625,13 +591,6 @@ LookupConformanceInModuleRequest::evaluate(
   if (!nominal || isa<ProtocolDecl>(nominal))
     return ProtocolConformanceRef::forMissingOrInvalid(type, protocol);
 
-  // We specially avoid recording conformances to invertible protocols in a
-  // class's conformance table. This prevents an evaluator cycle.
-  if (ctx.LangOpts.hasFeature(Feature::NoncopyableGenerics)
-      && isa<ClassDecl>(nominal)
-      && protocol->getInvertibleProtocolKind())
-        return getBuiltinInvertibleProtocolConformance(nominal, type, protocol);
-
   // Expand conformances added by extension macros.
   //
   // FIXME: This expansion should only be done if the