Compiler: sizeof(Bool) must be 1, not 0

[asterite]

Fixes #8272

I don't know why LLVM returns 0 for bool (i1). It seems that in C++ sizeof(bool) is implementation defined which isn't really good, so maybe LLVM chooses to return 0.

It's also interesting to know that (before this PR):

p sizeof(Bool) # => 0
p sizeof(Bool[1]) # => 1

That is, a static array of just one bool occupies one byte, per a bool occupies 0. In all other cases you have that sizeof(T) == sizeof(T[1]) because a static array has its memory inlined.

There are many ways we can solve this: we could use sizeof(T[1]) in Pointer, when we need to know the size of memory allocated by a pointer. Or we could make sizeof(Bool) be 1. I chose the latter because I think it's more intuitive, but I'm not sure.

[asterite]

I also just checked what Go does, and unsafe.Sizeof(x) with x := true returns 1, so I think this change is fine.

[bcardiff]

So llvm informs size(i1) != size({i1})? That’s weird