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

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/lib/CIR/Dialect/Transforms/IdiomRecognizer.cpp clang/test/CIR/Transforms/idiom-recognizer.cpp clang/include/clang/CIR/Dialect/Passes.h clang/lib/CIR/Lowering/CIRPasses.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CIR/Dialect/Transforms/IdiomRecognizer.cpp b/clang/lib/CIR/Dialect/Transforms/IdiomRecognizer.cpp
index ff1110f86..0b119c5ae 100644
--- a/clang/lib/CIR/Dialect/Transforms/IdiomRecognizer.cpp
+++ b/clang/lib/CIR/Dialect/Transforms/IdiomRecognizer.cpp
@@ -39,7 +39,8 @@ namespace mlir {
 
 namespace {
 
-struct IdiomRecognizerPass : public impl::IdiomRecognizerBase<IdiomRecognizerPass> {
+struct IdiomRecognizerPass
+    : public impl::IdiomRecognizerBase<IdiomRecognizerPass> {
   IdiomRecognizerPass() = default;
   void runOnOperation() override;
 

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