Function miniz_oxide::inflate::core::fill_bit_buffer

fn fill_bit_buffer(l: &mut LocalVars, in_iter: &mut InputWrapper<'_>)

Ensure that there is data in the bit buffer.

On 64-bit platform, we use a 64-bit value so this will result in there being at least 32 bits in the bit buffer. This function assumes that there is at least 4 bytes left in the input buffer.