alternate compilation taget ,for even faser compilation ,to lure vid-game-dev

[gintominto5329]

hi,
like the early days of c++ ,consider compiling to c ,and use tcc ,which is 6x times faster than gcc/clang ,hence the perfect target for vid-gam-dev

thanks

[chandlerc]

We already have aggressive compile time goals for the toolchain, and have good initial progress toward those goals. We think this will benefit many potential users of Carbon.