DIP56 Provide pragma to control function inlining

[Dicebot]

On Monday, 24 February 2014 at 18:00:39 UTC, Kapps wrote:
> Perhaps something like a -vinline similar to -vtls? You don't
> need to be spammed repeatedly every time you build saying
> something isn't inlined, yet this still gives an easy way of
> seeing which methods you requested to be inlined that were not.
> The flag would display only functions marked with pragma(inline,
> true).

As I have already mentioned in this thread, there already does 
exist pull request to add flag to print inlining diagnostics. It 
can be re-used once merged.