[COMPILER REQUEST]: sh-elf-gdc

### Compiler name

sh-elf-gdc

### Compiler version

13.2.0, tinyd-rt 0.1.1

### Compiler language

D

### Compiler homepage

https://gdcproject.org/

### Motivation

I maintain the DLang Dreamcast SDK, and having compiler explorer output for sh-elf in gdc would help track down issues and bottlenecks.

To get sh-elf-gdc running, you just have to compile it with the D runtime disabled (`--disable-libphobos`).
Additionally I maintain a minimal D runtime (without garbage collector) which can be used instead of the default D runtime.

Releases are tagged here
https://github.com/KitsunebiGames/tinyd-rt/releases

the source can just be downloaded and the runtime be added to the gdc search path.
The following compiler flags should also be passed to the compiler on compilation `-matomic-model=soft-imask -ftls-model=local-exec -m4-single-only`