[llvm] [AArch64][GISel] Add legalizer support for @llvm.umul.with.overflow.i128 (PR #170101)

[David Green via llvm-commits]

davemgreen wrote:

> I have also added split_store_128 to optimize i128 G_STORE(G_MERGE_VALUES(x, y)) into two i64 G_STOREs.

That sounds like it could be 2 separate patches? The two parts look independent.

https://github.com/llvm/llvm-project/pull/170101