[clang] [llvm] [mlir] [IR] Replace alignment argument with attribute on masked intrinsics (PR #163802)

[Nikita Popov via cfe-commits]

nikic wrote:

@Benjins I've landed https://github.com/llvm/llvm-project/commit/12bf1836dec8d5f47339b485727603568fa9e819 to avoid the assertion failure and indicate a user error instead.

https://github.com/llvm/llvm-project/pull/163802