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

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

If we hoist NumPatterns out of match() and make a static class value then we can avoid having to pass it as a template argument.

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