[llvm] [DAG] SDPatternMatch - Replaced runtime data structures with lengths known at compile time (PR #172064)

[Artur Bermond Torres via llvm-commits]

bermondd wrote:

I don't think I can select reviewers yet, but as these changes are relevant to a previous PR, CC @RKSimon @mshockwave 

https://github.com/llvm/llvm-project/pull/172064