`Buffer`: test new specs for `rcreate_mm`, `rcreate_free`
`Buffer`: test new specs for `rcreate_mm`, `rcreate_free`

mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star