Use i8* instead of void* for generated LLVM IR #8
Description
It looks like LLVM doesn't like using void* for opaque pointers. Trying to compile some LLVM IR actually gave me a useful hint:
$ /usr/local/Cellar/llvm/4.0.0_1/bin/opt add.ll
/usr/local/Cellar/llvm/4.0.0_1/bin/opt: add.ll:6:22: error: pointers to void are invalid - use i8* instead
define i32 @main(void*) {
Apparently, at least until opaque pointer types come to LLVM IR, the right type to use for this sort of thing is a pointer to 8-bit integers.
One easy way to do this would be to define a constant for the i8* type (called FUNCTION_ENV_TYPE?) and then use it wherever we currently have llvm.PointerType.create(llvm.VoidType.create(), 0).