[llvm] [DebugInfo] Simplify code with std::unordered_map::operator[] (NFC) (PR #112658)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-debuginfo

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/112658.diff


1 Files Affected:

- (modified) llvm/lib/DebugInfo/LogicalView/Readers/LVDWARFReader.cpp (+1-2) 


``````````diff
diff --git a/llvm/lib/DebugInfo/LogicalView/Readers/LVDWARFReader.cpp b/llvm/lib/DebugInfo/LogicalView/Readers/LVDWARFReader.cpp
index e85356b5eab0f4..1c523c01314977 100644
--- a/llvm/lib/DebugInfo/LogicalView/Readers/LVDWARFReader.cpp
+++ b/llvm/lib/DebugInfo/LogicalView/Readers/LVDWARFReader.cpp
@@ -1139,9 +1139,8 @@ void LVDWARFReader::updateReference(dwarf::Attribute Attr,
 // Get an element given the DIE offset.
 LVElement *LVDWARFReader::getElementForOffset(LVOffset Offset,
                                               LVElement *Element, bool IsType) {
-  auto Iter = ElementTable.try_emplace(Offset).first;
   // Update the element and all the references pointing to this element.
-  LVElementEntry &Entry = Iter->second;
+  LVElementEntry &Entry = ElementTable[Offset];
   if (!Entry.Element) {
     if (IsType)
       Entry.Types.insert(Element);

``````````

</details>


https://github.com/llvm/llvm-project/pull/112658