[CoroutineAccessors] TBDify synthesized defaults.

Author: nate-chandler

lib/SIL/IR/SILSymbolVisitor.cpp

@@ -823,6 +823,11 @@ class SILSymbolVisitorImpl : public ASTVisitor<SILSymbolVisitorImpl> {
             Visitor.addDispatchThunk(declRef);
             Visitor.addMethodDescriptor(declRef);
           }
+          auto *decl =
+              llvm::dyn_cast_or_null<AbstractFunctionDecl>(declRef.getDecl());
+          if (decl && decl->hasBody()) {
+            Visitor.addFunction(declRef);
+          }
         }
 
         void addAssociatedType(AssociatedType associatedType) {

test/TBD/coroutine_accessors.swift

@@ -0,0 +1,19 @@
+// RUN: %target-build-swift-dylib(%t/%target-library-name(thing)) \
+// RUN:     %s                                                    \
+// RUN:     -emit-tbd                                             \
+// RUN:     -Xfrontend -validate-tbd-against-ir=all               \
+// RUN:     -enable-library-evolution                             \
+// RUN:     -Xfrontend -tbd-install_name -Xfrontend thing         \
+// RUN:     -emit-module                                          \
+// RUN:     -module-name thing                                    \
+// RUN:     -enable-experimental-feature CoroutineAccessors
+
+// REQUIRES: swift_feature_CoroutineAccessors
+
+public struct S {}
+
+public protocol P {
+  associatedtype A
+
+  var s: S { read set }
+}