[llvm] [ExecutionEngine] Avoid repeated hash lookups (NFC) (PR #132587)

[David Spickett via llvm-commits]

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@@ -1515,15 +1515,15 @@ void RuntimeDyldELF::resolveAArch64Branch(unsigned SectionID,
   uint64_t Offset = RelI->getOffset();
   unsigned RelType = RelI->getType();
   // Look for an existing stub.
-  StubMap::const_iterator i = Stubs.find(Value);
-  if (i != Stubs.end()) {
+  auto [It, Inserted] = Stubs.try_emplace(Value);
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DavidSpickett wrote:

I think the problem here is that before, we only added an entry to the map if resolveAArch64ShortBranch returned false. Now, it could return true and it's too late, we already added the entry to the map.

https://github.com/llvm/llvm-project/pull/132587