Profile-guided optimization (PGO)

[Johan Engelen via digitalmars-d-ldc]

Hi David,
   Could you have a look at the PR again?
I think it is almost ready for merging. (two FIXME's left that I 
hope to address soon)

On Sunday, 13 December 2015 at 13:21:33 UTC, David Nadlinger 
wrote:
> On 11 Dec 2015, at 1:38, Johan Engelen via digitalmars-d-ldc 
> wrote:
>> What do you think about "llvm-profdata"? Should we ship that 
>> with LDC?
>
> Yes, we should probably ship it with the binary packages.

I have added llvm-profdata to the repo, and renamed the built 
executable to ldc-profdata (it has to be in-sync with the LLVM 
version that LDC was built with, and so the renaming prevents 
potential name clashing with a system installed profdata version).

>
> What is left to do before we can merge a first version into the 
> main repository? A partial list:
>
>  - Deal with the remaining FIXME comments (at least open 
> separate GitHub issues for them), as well as with commented-out 
> fragments from the Clang implementation.

I think I will just remove all unused Clang implementation code 
(it is related to coverage stuff, which I think we should 
implement in a different branch after PGO is merged).

Thanks!
   Johan