Shrink code produced by smallvec![].
#386
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Currently `smallvec![]` expands to this:
```
{
let count = 0usize;
#[allow(unused_mut)]
let mut vec = ::smallvec::SmallVec::new();
if count <= vec.capacity() {
vec
} else {
::smallvec::SmallVec::from_vec(::alloc::vec::Vec::new())
}
};
```
This commit adds a rule to the `smallvec!` macro for the zero-length
case so it instead expands to this:
```
::smallvec::SmallVec::new()
```
The `std::vec!` macro already has a similar special case.
This commit also improves the non-zero case.
- It removes the `#[allow(unused_mut)]`, which was only needed for the
zero-length case.
- It changes the `*` repetitions to `+`. (Again, like `std::vec`.)
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This is the backport of #385 from v2 to v1.