Debug Info: add support to mark member variables as artificial

This is the LLVM portion of r170154.

llvm-svn: 170156

llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp

@@ -1559,6 +1559,9 @@ DIE *CompileUnit::createMemberDIE(DIDerivedType DT) {
       MemberDie->addValue(dwarf::DW_AT_APPLE_property, dwarf::DW_FORM_ref4,
                           PropertyDie);
 
+  if (DT.isArtificial())
+    addFlag(MemberDie, dwarf::DW_AT_artificial);
+
   // This is only for backward compatibility.
   StringRef PropertyName = DT.getObjCPropertyName();
   if (!PropertyName.empty()) {

llvm/test/DebugInfo/X86/elf-names.ll

@@ -7,6 +7,7 @@
 ; CHECK: 0x0000003d:     DW_AT_name [DW_FORM_strp]       ( .debug_str[0x0000006d] = "D")
 ; CHECK: 0x00000044:     DW_TAG_member
 ; CHECK: 0x00000045:       DW_AT_name [DW_FORM_strp]     ( .debug_str[0x0000005d] = "c1")
+; CHECK: 0x0000008d:       DW_AT_artificial [DW_FORM_flag_present]       (true)
 
 %class.D = type { i32, i32, i32, i32 }