[CIR] Raise std::find call to cir.std.find

Also implement lowering back to `std::call` before lowering to LLVM.

Author: bcardosolopes

clang/include/clang/CIR/Dialect/IR/CIROps.td

@@ -1887,6 +1887,12 @@ def CallOp : CIR_Op<"call",
       $_state.addOperands(operands);
       if (!fn_type.isVoid())
         $_state.addTypes(fn_type.getReturnType());
+    }]>,
+    OpBuilder<(ins "SymbolRefAttr":$callee, "mlir::Type":$resType,
+              CArg<"ValueRange", "{}">:$operands), [{
+      $_state.addOperands(operands);
+      $_state.addAttribute("callee", callee);
+      $_state.addTypes(resType);
     }]>];
 
   let extraClassDeclaration = [{

clang/test/CIR/Transforms/idiom-recognizer.cpp

@@ -5,6 +5,10 @@
 // RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -std=c++20 -fclangir -fclangir-idiom-recognizer -emit-cir -I%S/../Inputs -mmlir --mlir-print-ir-after=cir-idiom-recognizer %s -o - 2>&1 | FileCheck %s -check-prefix=AFTER-IDIOM
 // RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -std=c++20 -fclangir -fclangir-idiom-recognizer -emit-cir -I%S/../Inputs -mmlir --mlir-print-ir-after=cir-lowering-prepare %s -o - 2>&1 | FileCheck %s -check-prefix=AFTER-LOWERING-PREPARE
 
+// RUN: %clang_cc1 -fclangir -emit-cir -I%S/../Inputs -mmlir --mlir-print-ir-before=cir-idiom-recognizer -std=c++20 -triple x86_64-unknown-linux-gnu %s -o - 2>&1 | FileCheck %s -check-prefix=BEFORE-IDIOM
+// RUN: %clang_cc1 -fclangir -emit-cir -I%S/../Inputs -mmlir --mlir-print-ir-after=cir-idiom-recognizer -std=c++20 -triple x86_64-unknown-linux-gnu %s -o - 2>&1 | FileCheck %s -check-prefix=AFTER-IDIOM
+// RUN: %clang_cc1 -fclangir -emit-cir -I%S/../Inputs -mmlir --mlir-print-ir-after=cir-lowering-prepare -std=c++20 -triple x86_64-unknown-linux-gnu %s -o - 2>&1 | FileCheck %s -check-prefix=AFTER-LOWERING-PREPARE
+
 // PASS_ENABLED:  IR Dump After IdiomRecognizer (cir-idiom-recognizer)
 
 #include "std-cxx.h"