[NFC] Reserve the number of operands before push_back

[omern1]

This reduces the number of allocations inside the loop.

Partially addresses #105836

[llvmbot]

@llvm/pr-subscribers-llvm-ir

Author: Nabeel Omer (omern1)

Changes

Partially addresses #105836

---

Full diff: https://github.com/llvm/llvm-project/pull/106234.diff

1 Files Affected:

• (modified) llvm/lib/IR/ConstantsContext.h (+1)

diff --git a/llvm/lib/IR/ConstantsContext.h b/llvm/lib/IR/ConstantsContext.h
index 2d12723a2329df..acf05379e8a2a6 100644
--- a/llvm/lib/IR/ConstantsContext.h
+++ b/llvm/lib/IR/ConstantsContext.h
@@ -292,6 +292,7 @@ template <class ConstantClass> struct ConstantAggrKeyType {
   ConstantAggrKeyType(const ConstantClass *C,
                       SmallVectorImpl<Constant *> &Storage) {
     assert(Storage.empty() && "Expected empty storage");
+    Storage.reserve(C->getNumOperands());
     for (unsigned I = 0, E = C->getNumOperands(); I != E; ++I)
       Storage.push_back(C->getOperand(I));
     Operands = Storage;

[nikic]

LGTM