[llvm] [llvm-debuginfo-analyzer] Add support for LLVM IR format. (PR #135440)

[Javier Lopez-Gomez via llvm-commits]

================
@@ -0,0 +1,2309 @@
+//===-- LVIRReader.cpp ----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This implements the LVIRReader class.
+// It supports LLVM text IR and bitcode format.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/LogicalView/Readers/LVIRReader.h"
+#include "llvm/CodeGen/DebugHandlerBase.h"
+#include "llvm/DebugInfo/LogicalView/Core/LVLine.h"
+#include "llvm/DebugInfo/LogicalView/Core/LVScope.h"
+#include "llvm/DebugInfo/LogicalView/Core/LVSymbol.h"
+#include "llvm/DebugInfo/LogicalView/Core/LVType.h"
+#include "llvm/IR/DebugInfoMetadata.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IRReader/IRReader.h"
+#include "llvm/Object/Error.h"
+#include "llvm/Object/IRObjectFile.h"
+#include "llvm/Support/FormatAdapters.h"
+#include "llvm/Support/FormatVariadic.h"
+#include "llvm/Support/SourceMgr.h"
+
+using namespace llvm;
+using namespace llvm::object;
+using namespace llvm::logicalview;
+
+#define DEBUG_TYPE "IRReader"
+
+// These flavours of DINodes are not implemented but technically possible:
+//   DW_TAG_APPLE_property   = 0x4200
+//   DW_TAG_atomic_type      = 0x0047
+//   DW_TAG_common_block     = 0x001a
+//   DW_TAG_file_type        = 0x0029
+//   DW_TAG_friend           = 0x002a
+//   DW_TAG_generic_subrange = 0x0045
+//   DW_TAG_immutable_type   = 0x004b
+//   DW_TAG_module           = 0x001e
+//   DW_TAG_variant_part     = 0x0033
+
+// Create a logical element and setup the following information:
+// - Name, DWARF tag, line
+// - Collect any file information
+LVElement *LVIRReader::constructElement(const DINode *DN) {
+  dwarf::Tag Tag = DN->getTag();
+  LVElement *Element = createElement(Tag);
+  if (Element) {
+    Element->setTag(Tag);
+    addMD(DN, Element);
+
+    StringRef Name = getMDName(DN);
+    if (!Name.empty())
+      Element->setName(Name);
----------------
jalopezg-git wrote:

```suggestion
    if (StringRef Name = getMDName(DN); !Name.empty())
      Element->setName(Name);
```

https://github.com/llvm/llvm-project/pull/135440