third_party/llvm-project/clang/test/CodeGenObjC/bitfield-gnu.m

// RUN: %clang -S -emit-llvm -fobjc-runtime=gcc -o %t %s
typedef enum { A1, A2 } A;
typedef struct { A a : 1; } B;
@interface Obj { B *b; } @end
@implementation Obj @end