[llvm] [DSE] Simplify code with MapVector::operator[] (NFC) (PR #111621)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/111621.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp (+1-4) 


``````````diff
diff --git a/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp b/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
index ce8c988ba531dd..6fce46a624c9c7 100644
--- a/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
+++ b/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
@@ -2259,10 +2259,7 @@ DSEState::eliminateDeadDefs(const MemoryLocationWrapper &KillingLocWrapper) {
                       KillingLocWrapper.MemLoc, DeadLocWrapper.MemLoc,
                       KillingOffset, DeadOffset);
       if (OR == OW_MaybePartial) {
-        auto Iter =
-            IOLs.insert(std::make_pair<BasicBlock *, InstOverlapIntervalsTy>(
-                DeadLocWrapper.DefInst->getParent(), InstOverlapIntervalsTy()));
-        auto &IOL = Iter.first->second;
+        auto &IOL = IOLs[DeadLocWrapper.DefInst->getParent()];
         OR = isPartialOverwrite(KillingLocWrapper.MemLoc, DeadLocWrapper.MemLoc,
                                 KillingOffset, DeadOffset,
                                 DeadLocWrapper.DefInst, IOL);

``````````

</details>


https://github.com/llvm/llvm-project/pull/111621