update the default panic handler on freestanding
update the default panic handler on freestanding

Now the infinite loop has a `@breakpoint()` in there.

zig-lang/zig,zig-lang/zig,raulgrell/zig,andrewrk/zig,andrewrk/zig,raulgrell/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig