Fix bot failure from 59733525

// OPT-NOT: call void @llvm.assume

// We should have only one @llvm.assume call, the one that was expanded

// from the builtin in the IR below, not the one fed by the type test.

// OPT: %cmp = icmp ne %struct.A* %0, null

// OPT: %cmp = icmp ne %struct.A* %{{.*}}, null

// OPT: void @llvm.assume(i1 %cmp)

// Check after the builtin assume again that we don't have a type test assume

// sequence.