Rename MaybeUninit::drop to assume_init_drop.
Rename MaybeUninit::drop to assume_init_drop.

graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust