[SILGen] Ensure that we don't emit a skipped isolated deinit

Fixes rdar://154373088 / issue #82523

Author: DougGregor

lib/SILGen/SILGen.cpp

@@ -1638,7 +1638,7 @@ void SILGenModule::emitObjCAllocatorDestructor(ClassDecl *cd,
   // Emit the isolated deallocating destructor.
   // If emitted, it implements actual deallocating and deallocating destructor
   // only switches executor
-  if (dd->hasBody() && isActorIsolated) {
+  if (dd->hasBody() && !dd->isBodySkipped() && isActorIsolated) {
     SILDeclRef dealloc(dd, SILDeclRef::Kind::IsolatedDeallocator);
     emitFunctionDefinition(dealloc, getFunction(dealloc, ForDefinition));
   }

test/Concurrency/deinit_isolation_objc.swift

@@ -2,6 +2,9 @@
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -disable-implicit-string-processing-module-import -target %target-future-triple -parse-as-library -emit-silgen -DSILGEN %s | %FileCheck %s
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -disable-implicit-string-processing-module-import -target %target-future-triple -parse-as-library -emit-silgen -DSILGEN %s | %FileCheck -check-prefix=CHECK-SYMB %s
 
+
+// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -disable-implicit-string-processing-module-import -target %target-future-triple -parse-as-library -emit-module -DSILGEN -experimental-skip-non-inlinable-function-bodies-without-types %s
+
 // REQUIRES: concurrency
 // REQUIRES: objc_interop