[llvm] [llvm-symbolizer] nfc, use map instead of vector (PR #69552)

[Chen Zheng via llvm-commits]

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@@ -134,7 +120,10 @@ Error SymbolizableObjectFile::addCoffExportSymbols(
     uint32_t NextOffset = I != E ? I->Offset : Export.Offset + 1;
     uint64_t SymbolStart = ImageBase + Export.Offset;
     uint64_t SymbolSize = NextOffset - Export.Offset;
-    Symbols.push_back({SymbolStart, SymbolSize, Export.Name, 0});
+    // If the SymbolStart exists, use the one with the large Size.
+    // This helps us avoid symbols with no size information (Size = 0).
+    if (!Symbols.count(SymbolStart) || SymbolSize >= Symbols[SymbolStart].Size)
+      Symbols[SymbolStart] = {SymbolSize, Export.Name, 0};
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chenzheng1030 wrote:

If two symbols have same address, it will follow legacy logic, i.e. use the one with the large size. So for your case, `aaa` will be kept in the `Symbols` while `bbb` will be dropped.

https://github.com/llvm/llvm-project/pull/69552