llvm-project

f00a7a49 - [DAG] Fold insert_subvector (splat X), (splat X), N2 - > splat X (#147380)

[DAG] Fold insert_subvector (splat X), (splat X), N2 - > splat X (#147380) If we're inserting a splat into a splat of the same value, then regardless of the index, the result is simply a splat of that value.