[clang] [CIR] Initial upstreaming of idiom recognizer pass (PR #172486)

[Bruno Cardoso Lopes via cfe-commits]

================
@@ -93,4 +93,15 @@ def LoweringPrepare : Pass<"cir-lowering-prepare"> {
   let dependentDialects = ["cir::CIRDialect"];
 }
 
+def IdiomRecognizer : Pass<"cir-idiom-recognizer"> {
----------------
bcardosolopes wrote:

Good catch!

https://github.com/llvm/llvm-project/pull/172486