Renesas RL78 architecture support

[XVilka]

RL78 Family is a 16-bit CPU core for embedded microcontrollers of Renesas Electronics introduced in 2010.

They are commonly used in automotive applications.

r01uh0200ej0231-rl78g12.pdf

RL78 Hardware.pdf

Compilers and tools:

• https://www.renesas.com/us/en/software-tool/c-compiler-package-rl78-family#download
• https://llvm-gcc-renesas.com/rl78/rl78-download-toolchains/
• https://gcc.gnu.org/onlinedocs/gcc/RL78-Options.html
• QEMU https://github.com/afaerber/qemu-rl78 (abandoned)