[MS] Always use base dtors in place of complete/vbase dtors when possible

Summary:
Previously we tried too hard to uphold the fiction that destructor
variants work like they do on Itanium throughout the ABI-neutral parts
of clang. This lead to MS C++ ABI incompatiblities and other bugs. Now,
-mconstructor-aliases will no longer control this ABI detail, and clang
-cc1's LLVM IR output will be this much closer to the clang driver's.

Based on a patch by Zahira Ammarguellat:
  https://reviews.llvm.org/D39063

I've tried to move the logic that Zahira added into MicrosoftCXXABI.cpp.
There is only one ABI-specific detail sticking out, and that is in
CodeGenModule::getAddrOfCXXStructor, where we collapse complete dtors to
base dtors in the MS ABI.

This fixes PR32990.

Reviewers: erichkeane, zahiraam, majnemer, rjmccall

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D44505

llvm-svn: 327732

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/test/CodeGenCoroutines/coro-promise-dtor.cpp b/clang/test/CodeGenCoroutines/coro-promise-dtor.cpp
index 5cc472054a5..53e07eeb2a1 100644
--- a/clang/test/CodeGenCoroutines/coro-promise-dtor.cpp
+++ b/clang/test/CodeGenCoroutines/coro-promise-dtor.cpp
@@ -44,4 +44,4 @@ coro_t f() {
 // CHECK:  br i1 %[[NRVO]], label %{{.+}}, label %[[DTOR:.+]]
 
 // CHECK: [[DTOR]]:
-// CHECK:  call void @"\01??_Dcoro_t@@QEAAXXZ"(
+// CHECK:  call void @"\01??1coro_t@@QEAA@XZ"(