[lldb] Fix crash missing MSInheritanceAttr on CXXRecordDecl with DWARF on Windows

lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp

@@ -2771,6 +2771,9 @@ static bool GetCompleteQualType(clang::ASTContext *ast,
         ast, llvm::cast<clang::AttributedType>(qual_type)->getModifiedType(),
         allow_completion);
 
+  case clang::Type::MemberPointer:
+    return !qual_type.getTypePtr()->isIncompleteType();
+
   default:
     break;
   }

lldb/test/Shell/SymbolFile/DWARF/x86/member-pointers.cpp

@@ -0,0 +1,46 @@
+// Itanium ABI:
+// RUN: %clang --target=x86_64-pc-linux -gdwarf -c -o %t_linux.o %s
+// RUN: %lldb -f %t_linux.o -b -o "target variable mp1 mp2 mp3 mp4 mp5 mp6 mp7 mp8 mp9" | FileCheck %s
+//
+// CHECK: (char SI2::*) mp9 = 0x0000000000000000
+
+// Microsoft ABI:
+// RUN: %clang_cl --target=x86_64-windows-msvc -c -gdwarf %s -o %t_win.obj
+// RUN: lld-link /out:%t_win.exe %t_win.obj /nodefaultlib /entry:main /debug
+// RUN: %lldb -f %t_win.exe -b -o "target variable mp1 mp2 mp3 mp4 mp5 mp6 mp7 mp8 mp9" | FileCheck --check-prefix=CHECK-MSVC %s
+//
+// DWARF has no representation of MSInheritanceAttr, so we cannot determine the size
+// of member-pointers yet. For the moment, make sure we don't crash on such variables.
+// CHECK-MSVC: error: Unable to determine byte size.
+
+class SI {
+  double si;
+};
+struct SI2 {
+  char si2;
+};
+class MI : SI, SI2 {
+  int mi;
+};
+class MI2 : MI {
+  int mi2;
+};
+class VI : virtual MI {
+  int vi;
+};
+class VI2 : virtual SI, virtual SI2 {
+  int vi;
+};
+class /* __unspecified_inheritance*/ UI;
+
+double SI::*mp1 = nullptr;
+int MI::*mp2 = nullptr;
+int MI2::*mp3 = nullptr;
+int VI::*mp4 = nullptr;
+int VI2::*mp5 = nullptr;
+int UI::*mp6 = nullptr;
+int MI::*mp7 = nullptr;
+int VI2::*mp8 = nullptr;
+char SI2::*mp9 = &SI2::si2;
+
+int main() { return 0; }