[llvm] [SandboxVec][BottomUpVec] Implement pack of scalars (PR #115549)

[via llvm-commits]

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@@ -164,7 +164,39 @@ void BottomUpVec::tryEraseDeadInstrs() {
   DeadInstrCandidates.clear();
 }
 
-Value *BottomUpVec::vectorizeRec(ArrayRef<Value *> Bndl) {
+Value *BottomUpVec::createPack(ArrayRef<Value *> ToPack) {
+  BasicBlock::iterator WhereIt = getInsertPointAfterInstrs(ToPack);
+
+  Type *ScalarTy = VecUtils::getCommonScalarType(ToPack);
+  unsigned Lanes = VecUtils::getNumLanes(ToPack);
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vporpo wrote:

They won't necessarily have the same type. You can have a bundle like: `{i32, <2 x i32>, i32}`.

https://github.com/llvm/llvm-project/pull/115549