Revert "Debug Info: Add basic support for external types references."

This reverts commit r242302. External type refs of this form were
never used by any LLVM frontend so this is effectively dead code.
(They were introduced to support clang module debug info, but in the
end we came up with a better design that doesn't use this feature at
all.)

rdar://problem/25897929

Differential Revision: https://reviews.llvm.org/D30917

llvm-svn: 297684

1 files changed, 0 insertions, 52 deletions

diff --git a/llvm/test/DebugInfo/X86/externaltyperef.ll b/llvm/test/DebugInfo/X86/externaltyperef.ll
deleted file mode 100644
index 4cd7f8c00c7..00000000000
--- a/llvm/test/DebugInfo/X86/externaltyperef.ll
+++ /dev/null
@@ -1,52 +0,0 @@
-; REQUIRES: object-emission
-; RUN: %llc_dwarf -filetype=obj -O0 < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
-; Manually derived by externalizing the composite types from:
-;
-;   namespace N { class B; }
-;   using N::B;
-;   class A;
-;   A *a;
-;
-; Test the direct use of an external type.
-; CHECK: DW_TAG_variable
-; CHECK:   DW_AT_type [DW_FORM_ref4]	  {{.*}}{[[PTR:.*]]}
-; CHECK: [[PTR]]: DW_TAG_pointer_type
-; CHECK:   DW_AT_type [DW_FORM_ref4]  	  {{.*}}{[[A:.*]]}
-; CHECK: [[A]]: DW_TAG_class_type
-; CHECK:   DW_AT_declaration [DW_FORM_flag]	(0x01)
-; CHECK:   DW_AT_signature [DW_FORM_ref_sig8]	(0x4e834ea939695c24)
-; CHECK: [[B:.*]]: DW_TAG_class_type
-; CHECK:   DW_AT_declaration [DW_FORM_flag]	(0x01)
-; CHECK:   DW_AT_signature [DW_FORM_ref_sig8]	(0x942e51c7addda5f7)
-; CHECK:   DW_TAG_imported_declaration
-; CHECK:     DW_AT_import [DW_FORM_ref4]  {{.*}}[[B]]
-
-source_filename = "test/DebugInfo/X86/externaltyperef.ll"
-target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
-target triple = "x86_64-apple-macosx10.10.0"
-
-%class.A = type opaque
-
-@a = global %class.A* null, align 8, !dbg !0
-
-!llvm.dbg.cu = !{!2}
-!llvm.module.flags = !{!12, !13, !14}
-!llvm.ident = !{!15}
-
-!0 = !DIGlobalVariableExpression(var: !1)
-!1 = !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 2, type: !11, isLocal: false, isDefinition: true)
-!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 3.7.0 (trunk 242039) (llvm/trunk 242046)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !5, globals: !8, imports: !9)
-!3 = !DIFile(filename: "test.cpp", directory: "/")
-!4 = !{}
-!5 = !{!6, !7}
-!6 = !DICompositeType(tag: DW_TAG_class_type, name: "A", file: !3, flags: DIFlagExternalTypeRef, identifier: "_ZTS1A")
-!7 = !DICompositeType(tag: DW_TAG_class_type, name: "A", file: !3, flags: DIFlagExternalTypeRef, identifier: "_ZTSN1N1BE")
-!8 = !{!0}
-!9 = !{!10}
-!10 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !2, entity: !7, line: 4)
-!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !6, size: 64, align: 64)
-!12 = !{i32 2, !"Dwarf Version", i32 2}
-!13 = !{i32 2, !"Debug Info Version", i32 3}
-!14 = !{i32 1, !"PIC Level", i32 2}
-!15 = !{!"clang version 3.7.0 (trunk 242039) (llvm/trunk 242046)"}
-