[llvm][DebugInfo][test] Add LLVM tests for Objective-C property debug-info (llvm#165373)

The IR->DWARF pipeline was not properly tested before. This patch adds a
test to generate DWARF for various `DIObjCProperty` constructions.

This caught a couple of bugs:
1. The `DW_AT_APPLE_property_getter` and `DW_AT_APPLE_property_setter`
properties were emitted the wrong way around.
2. The `DW_TAG_member` ivars were not linking back to the property that
they back.

These will be fixed in follow-up patches.

Author: Michael137

llvm/test/DebugInfo/Generic/objc-property.ll

@@ -0,0 +1,89 @@
+; RUN: llc -filetype=obj -o - %s | llvm-dwarfdump --debug-info - | FileCheck %s
+
+; CHECK: DW_TAG_structure_type
+; CHECK:   DW_AT_name ("Foo")
+;
+; CHECK:   DW_TAG_APPLE_property
+; CHECK:     DW_AT_APPLE_property_name ("autoSynthProp")
+; CHECK:     DW_AT_APPLE_property_attribute
+; CHECK-SAME: DW_APPLE_PROPERTY_assign, DW_APPLE_PROPERTY_readwrite,
+; CHECK-SAME: DW_APPLE_PROPERTY_atomic, DW_APPLE_PROPERTY_unsafe_unretained
+;
+; CHECK:   DW_TAG_APPLE_property
+; CHECK:     DW_AT_APPLE_property_name ("synthProp")
+; CHECK:     DW_AT_APPLE_property_attribute
+; CHECK-SAME: DW_APPLE_PROPERTY_assign, DW_APPLE_PROPERTY_readwrite,
+; CHECK-SAME: DW_APPLE_PROPERTY_atomic, DW_APPLE_PROPERTY_unsafe_unretained
+;
+; FIXME: this should have a DW_AT_APPLE_property_getter tag
+; CHECK:   DW_TAG_APPLE_property
+; CHECK:     DW_AT_APPLE_property_name ("customGetterProp")
+; CHECK:     DW_AT_APPLE_property_setter   ("customGetter")
+; CHECK:     DW_AT_APPLE_property_attribute
+; CHECK-SAME: DW_APPLE_PROPERTY_getter, DW_APPLE_PROPERTY_assign, DW_APPLE_PROPERTY_readwrite,
+; CHECK-SAME: DW_APPLE_PROPERTY_atomic, DW_APPLE_PROPERTY_unsafe_unretained
+;
+; FIXME: this should have a DW_AT_APPLE_property_setter tag
+; CHECK:   DW_TAG_APPLE_property
+; CHECK:     DW_AT_APPLE_property_name ("customSetterProp")
+; CHECK:     DW_AT_APPLE_property_getter   ("customSetter:")
+; CHECK:     DW_AT_APPLE_property_attribute
+; CHECK-SAME: DW_APPLE_PROPERTY_assign, DW_APPLE_PROPERTY_readwrite,
+; CHECK-SAME: DW_APPLE_PROPERTY_setter, DW_APPLE_PROPERTY_atomic, DW_APPLE_PROPERTY_unsafe_unretained
+;
+; FIXME: the DW_AT_APPLE_property_(getter|setter) values are inverted
+; CHECK:   DW_TAG_APPLE_property
+; CHECK:     DW_AT_APPLE_property_name ("customAccessorsProp")
+; CHECK:     DW_AT_APPLE_property_getter   ("customSetter:")
+; CHECK:     DW_AT_APPLE_property_setter   ("customGetter")
+; CHECK:     DW_AT_APPLE_property_attribute
+; CHECK-SAME: DW_APPLE_PROPERTY_getter, DW_APPLE_PROPERTY_assign, DW_APPLE_PROPERTY_readwrite,
+; CHECK-SAME: DW_APPLE_PROPERTY_setter, DW_APPLE_PROPERTY_atomic, DW_APPLE_PROPERTY_unsafe_unretained
+;
+; FIXME: missing link between DW_TAG_member and the associated DW_TAG_APPLE_property
+; CHECK:   DW_TAG_member
+; CHECK-NOT: DW_AT_APPLE_property
+; CHECK:   DW_TAG_member
+; CHECK-NOT: DW_AT_APPLE_property
+; CHECK:   DW_TAG_member
+; CHECK-NOT: DW_AT_APPLE_property
+; CHECK:   DW_TAG_member
+; CHECK-NOT: DW_AT_APPLE_property
+
+!llvm.module.flags = !{!0, !1}
+!llvm.dbg.cu = !{!2}
+
+!0 = !{i32 7, !"Dwarf Version", i32 5}
+!1 = !{i32 2, !"Debug Info Version", i32 3}
+!2 = distinct !DICompileUnit(language: DW_LANG_ObjC, file: !3, producer: "hand written", isOptimized: false, runtimeVersion: 2, emissionKind: FullDebug, retainedTypes: !4, splitDebugInlining: false, debugInfoForProfiling: true, nameTableKind: Apple)
+!3 = !DIFile(filename: "main.m", directory: "/tmp")
+!4 = !{!5}
+!5 = !DICompositeType(tag: DW_TAG_structure_type, name: "Foo", scope: !3, file: !3, line: 1, size: 128, flags: DIFlagObjcClassComplete, elements: !6, runtimeLang: DW_LANG_ObjC)
+!6 = !{!7, !9, !10, !11, !12, !13, !14, !15, !16, !17, !24, !27, !28, !29, !30, !31, !32}
+!7 = !DIObjCProperty(name: "autoSynthProp", file: !3, line: 5, attributes: 2316, type: !8)
+!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!9 = !DIObjCProperty(name: "synthProp", file: !3, line: 6, attributes: 2316, type: !8)
+!10 = !DIObjCProperty(name: "customGetterProp", file: !3, line: 7, getter: "customGetter", attributes: 2318, type: !8)
+!11 = !DIObjCProperty(name: "customSetterProp", file: !3, line: 8, setter: "customSetter:", attributes: 2444, type: !8)
+!12 = !DIObjCProperty(name: "customAccessorsProp", file: !3, line: 9, setter: "customSetter:", getter: "customGetter", attributes: 2446, type: !8)
+!13 = !DIDerivedType(tag: DW_TAG_member, name: "someBackingIvar", scope: !3, file: !3, line: 2, baseType: !8, size: 32, flags: DIFlagProtected, extraData: !9)
+!14 = !DIDerivedType(tag: DW_TAG_member, name: "_autoSynthProp", scope: !3, file: !3, line: 5, baseType: !8, size: 32, flags: DIFlagPrivate, extraData: !7)
+!15 = !DIDerivedType(tag: DW_TAG_member, name: "_customGetterProp", scope: !3, file: !3, line: 7, baseType: !8, size: 32, flags: DIFlagPrivate, extraData: !10)
+!16 = !DIDerivedType(tag: DW_TAG_member, name: "_customSetterProp", scope: !3, file: !3, line: 8, baseType: !8, size: 32, flags: DIFlagPrivate, extraData: !11)
+!17 = !DISubprogram(name: "-[Foo customGetter]", scope: !5, file: !3, line: 19, type: !18, scopeLine: 19, flags: DIFlagPrototyped, spFlags: DISPFlagLocalToUnit)
+!18 = !DISubroutineType(types: !19)
+!19 = !{!8, !20, !21}
+!20 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!21 = !DIDerivedType(tag: DW_TAG_typedef, name: "SEL", file: !3, baseType: !22, flags: DIFlagArtificial)
+!22 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !23, size: 64)
+!23 = !DICompositeType(tag: DW_TAG_structure_type, name: "objc_selector", file: !3, flags: DIFlagFwdDecl)
+!24 = !DISubprogram(name: "-[Foo customSetter:]", scope: !5, file: !3, line: 23, type: !25, scopeLine: 23, flags: DIFlagPrototyped, spFlags: DISPFlagLocalToUnit)
+!25 = !DISubroutineType(types: !26)
+!26 = !{null, !20, !21, !8}
+!27 = !DISubprogram(name: "-[Foo synthProp]", scope: !5, file: !3, line: 17, type: !18, scopeLine: 17, flags: DIFlagArtificial | DIFlagPrototyped, spFlags: DISPFlagLocalToUnit)
+!28 = !DISubprogram(name: "-[Foo setSynthProp:]", scope: !5, file: !3, line: 17, type: !25, scopeLine: 17, flags: DIFlagArtificial | DIFlagPrototyped, spFlags: DISPFlagLocalToUnit)
+!29 = !DISubprogram(name: "-[Foo autoSynthProp]", scope: !5, file: !3, line: 5, type: !18, scopeLine: 5, flags: DIFlagArtificial | DIFlagPrototyped, spFlags: DISPFlagLocalToUnit)
+!30 = !DISubprogram(name: "-[Foo setAutoSynthProp:]", scope: !5, file: !3, line: 5, type: !25, scopeLine: 5, flags: DIFlagArtificial | DIFlagPrototyped, spFlags: DISPFlagLocalToUnit)
+!31 = !DISubprogram(name: "-[Foo setCustomGetterProp:]", scope: !5, file: !3, line: 7, type: !25, scopeLine: 7, flags: DIFlagArtificial | DIFlagPrototyped, spFlags: DISPFlagLocalToUnit)
+!32 = !DISubprogram(name: "-[Foo customSetterProp]", scope: !5, file: !3, line: 8, type: !18, scopeLine: 8, flags: DIFlagArtificial | DIFlagPrototyped, spFlags: DISPFlagLocalToUnit)
+