Compiler benchmarker for D, C, C++, Go, Rust with more to come

[Per Nordlöw]

On Monday, 21 October 2019 at 11:27:05 UTC, Per Nordlöw wrote:
> On Monday, 21 October 2019 at 11:07:14 UTC, Márcio Martins 
> wrote:
>> Any reason why you left Go's `gc` out?

Note that I just changed `-c` to `-S` in the call go `gccgo` in 
`benchmark` to skip assmembly phase.