https://reviews.llvm.org/D74094

foo1.cpp

struct foo {
  int x;
};

// Returns a reference to the minimum foo.
foo &&min(foo &&a, foo &&b);

void consume (foo&&);

void bar () {
  consume(min(foo{0}, foo{1}));
}

foo1.ll

define dso_local void @_Z3barv() #0 {
entry:
  %ref.tmp = alloca %struct.foo, align 4
  %ref.tmp1 = alloca %struct.foo, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %ref.tmp) #3
  %x = getelementptr inbounds %struct.foo, ptr %ref.tmp, i32 0, i32 0
  store i32 0, ptr %x, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %ref.tmp1) #3
  %x2 = getelementptr inbounds %struct.foo, ptr %ref.tmp1, i32 0, i32 0
  store i32 1, ptr %x2, align 4, !tbaa !5
  %call = call noundef nonnull align 4 dereferenceable(4) ptr @_Z3minO3fooS0_(ptr noundef nonnull align 4 dereferenceable(4) %ref.tmp, ptr noundef nonnull align 4 dereferenceable(4) %ref.tmp1)
  call void @_Z7consumeO3foo(ptr noundef nonnull align 4 dereferenceable(4) %call)
  call void @llvm.lifetime.end.p0(i64 4, ptr %ref.tmp1) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %ref.tmp) #3
  ret void
}

foo2.cpp

struct foo {
  int x;
};

// Returns a reference to the minimum foo.
const foo &min(const foo &a, const foo &b);

void consume (const foo&);

void bar () {
  consume(min(foo{0}, foo{1}));
}

foo2.ll

define dso_local void @_Z3barv() #0 {
entry:
  %ref.tmp = alloca %struct.foo, align 4
  %ref.tmp1 = alloca %struct.foo, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %ref.tmp) #3
  %x = getelementptr inbounds %struct.foo, ptr %ref.tmp, i32 0, i32 0
  store i32 0, ptr %x, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %ref.tmp1) #3
  %x2 = getelementptr inbounds %struct.foo, ptr %ref.tmp1, i32 0, i32 0
  store i32 1, ptr %x2, align 4, !tbaa !5
  %call = call noundef nonnull align 4 dereferenceable(4) ptr @_Z3minRK3fooS1_(ptr noundef nonnull align 4 dereferenceable(4) %ref.tmp, ptr noundef nonnull align 4 dereferenceable(4) %ref.tmp1)
  call void @_Z7consumeRK3foo(ptr noundef nonnull align 4 dereferenceable(4) %call)
  call void @llvm.lifetime.end.p0(i64 4, ptr %ref.tmp1) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %ref.tmp) #3
  ret void
}