[GenericDomTreeConstruction] Use SmallVector (NFC) (#96138)

The use of SmallVector here saves 4.7% of heap allocations during the
compilation of ConvertExpr.cpp.ii, a preprocessed version of
flang/lib/Lower/ConvertExpr.cpp.

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/include/llvm/Support/GenericDomTreeConstruction.h b/llvm/include/llvm/Support/GenericDomTreeConstruction.h
index 29b5f91..a216cd2 100644
--- a/llvm/include/llvm/Support/GenericDomTreeConstruction.h
+++ b/llvm/include/llvm/Support/GenericDomTreeConstruction.h
@@ -72,7 +72,7 @@ struct SemiNCAInfo {
 
   // Number to node mapping is 1-based. Initialize the mapping to start with
   // a dummy element.
-  std::vector<NodePtr> NumToNode = {nullptr};
+  SmallVector<NodePtr, 64> NumToNode = {nullptr};
   DenseMap<NodePtr, InfoRec> NodeToInfo;
 
   using UpdateT = typename DomTreeT::UpdateType;