[llvm] [RISCV][TTI] Recognize CONCAT_VECTORS if a shufflevector mask is multiple insert subvector. (PR #110457)

[Philip Reames via llvm-commits]

preames wrote:

> Hi, even though the comments were marked as resolved PRs usually still need explicit approval before being merged.

I have reverted this commit as it violates project review policy.  Feel free to move to a new review, but you need to have approval before landing.

https://github.com/llvm/llvm-project/pull/110457