Auto merge of #27825 - withoutboats:default_array, r=alexcrichton
Auto merge of #27825 - withoutboats:default_array, r=alexcrichton

Implemented Default for arrays up to length 32 where T: Default using an additional macro.

graydon/rust,graydon/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,dwillmer/rust,aidancully/rust,dwillmer/rust,graydon/rust,dwillmer/rust,dwillmer/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,dwillmer/rust,aidancully/rust,dwillmer/rust,graydon/rust,aidancully/rust,GBGamer/rust,dwillmer/rust,GBGamer/rust,dwillmer/rust,aidancully/rust