Changed WEBCL_OPTIONALLY_VISIBLE_INFO to WEBCL_debug_info, as per discussion in public bug 1041 https://www.khronos.org/bugzilla/show_bug.cgi?id=1041
name changes based on public bug 1041 https://www.khronos.org/bugzilla/show_bug.cgi?id=1041
Merge branch 'master' of https://github.com/KhronosGroup/WebCL