Optimizer hangs on non-terminating while loop

Compilation of the following kernel loops indefinitely:

kernel void A() {
  int a = get_global_id(0);
  while (a < 512) {}
}

Passing argument -cl-opt-disable to clBuildProgram() prevents this.

Reproduced on:

• /opt/intel/opencl-1.2-6.4.0.25/lib64/libintelocl.so
• /opt/intel/opencl-1.2-4.4.0.117/lib64/libintelocl.so