[Distributed] Dont emit TBD also for distributed thunks

This resolves pedantic "all" TBD validation issues, i.e. we dont emit
unexpected records anymore - we would before as we only checked for
is_distributed but we also want to skip those for is_distributed_thunk

resolves rdar://128284016

Author: ktoso

lib/IRGen/GenMeta.cpp

@@ -1002,7 +1002,7 @@ namespace {
       // Emit the dispatch thunk.
       auto shouldEmitDispatchThunk =
           (Resilient || IGM.getOptions().WitnessMethodElimination) &&
-          !func.isDistributed();
+          (!func.isDistributed() || !func.isDistributedThunk());
       if (shouldEmitDispatchThunk) {
         IGM.emitDispatchThunk(func);
       }

test/TBD/distributed_library_evolution.swift

@@ -9,6 +9,7 @@
 // RUN:     -enable-library-evolution                                          \
 // RUN:     -disable-availability-checking                                     \
 // RUN:     -emit-ir -o %t/test.ll -emit-tbd                                   \
+// RUN:     -validate-tbd-against-ir=all                                       \
 // RUN:     -emit-tbd-path %t/library.tbd -I %t -tbd-install_name protocol
 
 // RUN: %target-swift-frontend %t/library.swift                                \
@@ -18,9 +19,11 @@
 // RUN:     -package-name Package                                              \
 // RUN:     -module-name Library                                               \
 // RUN:     -emit-module-path %t/Library.swiftmodule                           \
+// RUN:     -validate-tbd-against-ir=all                                       \
 // RUN:     -emit-module-interface-path %t/Library.swiftinterface
 
-// RUN: %target-swift-frontend %t/actor.swift -enable-library-evolution \
+// RUN: %target-swift-frontend %t/actor.swift                               \
+// RUN:     -enable-library-evolution \
 // RUN:     -disable-availability-checking -emit-ir -o %t/test.ll -emit-tbd \
 // RUN:     -emit-tbd-path %t/actor.tbd -I %t -tbd-install_name actor
 
@@ -31,7 +34,8 @@
 // RUN:     -package-name Package                                          \
 // RUN:     -enable-library-evolution                                      \
 // RUN:     -module-name Client                                            \
-// RUN:     -emit-module-path %t/Client.swiftmodule                       \
+// RUN:     -emit-module-path %t/Client.swiftmodule                        \
+// RUN:     -validate-tbd-against-ir=all                                   \
 // RUN:     -emit-module-interface-path %t/Client.swiftinterface