[LTO][Pipeline][Coro] Add missing coro pass to O0 post-link thinlto pipeline (#159497)

Add missing coroutine passes so that coro code can be correctly
compiled.

Fix #155558

Author: NewSigma

llvm/lib/Passes/PassBuilderPipelines.cpp

@@ -1831,6 +1831,7 @@ ModulePassManager PassBuilder::buildThinLTODefaultPipeline(
     // in ICP.
     MPM.addPass(LowerTypeTestsPass(nullptr, nullptr,
                                    lowertypetests::DropTestKind::Assume));
+    MPM.addPass(buildCoroWrapper(ThinOrFullLTOPhase::ThinLTOPostLink));
     // Drop available_externally and unreferenced globals. This is necessary
     // with ThinLTO in order to avoid leaving undefined references to dead
     // globals in the object file.

llvm/test/Other/new-pm-O0-defaults.ll

@@ -44,6 +44,7 @@
 ; CHECK-PRE-LINK: Running pass: CanonicalizeAliasesPass
 ; CHECK-PRE-LINK-NEXT: Running pass: NameAnonGlobalPass
 ; CHECK-THINLTO: Running pass: LowerTypeTestsPass
+; CHECK-THINLTO-NEXT: Running pass: CoroConditionalWrapper
 ; CHECK-THINLTO-NEXT: Running pass: EliminateAvailableExternallyPass
 ; CHECK-THINLTO-NEXT: Running pass: GlobalDCEPass
 ; CHECK-LTO: Running pass: CrossDSOCFIPass on [module]