[CIR][CodeGen] Add missing conversion patterns for ControlFlowDialect

Fixes #4.

Author: cmarcelo

clang/lib/CIR/CodeGen/LowerToLLVM.cpp

@@ -12,6 +12,7 @@
 
 #include "mlir/Conversion/AffineToStandard/AffineToStandard.h"
 #include "mlir/Conversion/ArithmeticToLLVM/ArithmeticToLLVM.h"
+#include "mlir/Conversion/ControlFlowToLLVM/ControlFlowToLLVM.h"
 #include "mlir/Conversion/FuncToLLVM/ConvertFuncToLLVM.h"
 #include "mlir/Conversion/FuncToLLVM/ConvertFuncToLLVMPass.h"
 #include "mlir/Conversion/LLVMCommon/ConversionTarget.h"
@@ -462,6 +463,8 @@ void ConvertCIRToLLVMPass::runOnOperation() {
   mlir::arith::populateArithmeticToLLVMConversionPatterns(typeConverter,
                                                           patterns);
   populateSCFToControlFlowConversionPatterns(patterns);
+  mlir::cf::populateControlFlowToLLVMConversionPatterns(typeConverter,
+                                                        patterns);
   populateMemRefToLLVMConversionPatterns(typeConverter, patterns);
   populateFuncToLLVMConversionPatterns(typeConverter, patterns);
 

clang/test/CIR/CIRToLLVM/goto.cir

@@ -1,10 +1,6 @@
 // RUN: cir-tool %s -canonicalize -cir-to-func -cir-to-memref -o - | FileCheck %s -check-prefix=MLIR
 // RUN: cir-tool %s -canonicalize -cir-to-func -cir-to-memref -cir-to-llvm -o - | mlir-translate -mlir-to-llvmir | FileCheck %s -check-prefix=LLVM
 
-// FIXME: after rebasing against July's 2022 mlir, we get "failed to legalize
-//        operation 'cf.br'" from -cir-to-llvm
-// XFAIL: *
-
 module {
   cir.func @foo() {
     %0 = cir.alloca i32, cir.ptr <i32>, ["b", cinit] {alignment = 4 : i64}