Changing -O to be equivalent to -O3

[David Nadlinger]

On Monday, 18 March 2013 at 02:25:17 UTC, John Colvin wrote:
> On Sunday, 17 March 2013 at 18:33:57 UTC, David Nadlinger wrote:
>> See: https://github.com/ldc-developers/ldc/pull/315
>>
>> Any further opinions?
>>
>> David
>
> why not O5?

Because -O5 is the same as -O3 right now. I thought this was 
documented somewhere, but apparently this is not the case. Do you 
want to fix it? ;)

David