DMD release compiler flags when building with LDC

[kinke]

On Wednesday, 23 October 2019 at 11:29:11 UTC, Daniel Kozak wrote:
> Not exactly, build.d has been use only for some part of dmd, so 
> this is reason why I have opened 
> https://bugs.archlinux.org/task/63569. There has been mismatch 
> (some code has been compiled witl LTO and some was not ). It is 
> possible right now build.d is used for everything so it could 
> work.

It looked like it was all compiled with build.d, but I only 
glanced over it. Mixing bitcode and machine code objects should 
be fine; archiving a mix into static libraries too, but that 
requires archiving with LDC (`-lib`).