[clang][DebugInfo] Emit DW_AT_deleted on any deleted member function

Currently we emit `DW_AT_deleted` for `deleted` special-member
functions (i.e., ctors/dtors). However, in C++ one can mark any
member function as deleted. This patch expands the set of member
functions for which we emit `DW_AT_deleted`.

The DWARFv5 spec section 5.7.8 says:
```
<non-normative>
In C++, a member function may be declared as deleted. This prevents the compiler from
generating a default implementation of a special member function such as a constructor
or destructor, and can affect overload resolution when used on other member functions.
</non-normative>

If the member function entry has been declared as deleted, then that entry has a
DW_AT_deleted attribute.
```

Thus this change is conforming.

Differential Revision: https://reviews.llvm.org/D153282

1 files changed, 2 insertions, 21 deletions

diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index 2fd2227..f049a682 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -1945,27 +1945,8 @@ llvm::DISubprogram *CGDebugInfo::CreateCXXMemberFunction(
     ContainingType = RecordTy;
   }
 
-  // We're checking for deleted C++ special member functions
-  // [Ctors,Dtors, Copy/Move]
-  auto checkAttrDeleted = [&](const auto *Method) {
-    if (Method->getCanonicalDecl()->isDeleted())
-      SPFlags |= llvm::DISubprogram::SPFlagDeleted;
-  };
-
-  switch (Method->getKind()) {
-
-  case Decl::CXXConstructor:
-  case Decl::CXXDestructor:
-    checkAttrDeleted(Method);
-    break;
-  case Decl::CXXMethod:
-    if (Method->isCopyAssignmentOperator() ||
-        Method->isMoveAssignmentOperator())
-      checkAttrDeleted(Method);
-    break;
-  default:
-    break;
-  }
+  if (Method->getCanonicalDecl()->isDeleted())
+    SPFlags |= llvm::DISubprogram::SPFlagDeleted;
 
   if (Method->isNoReturn())
     Flags |= llvm::DINode::FlagNoReturn;