Auto merge of #42993 - stepancheg:editorconfig, r=brson
Auto merge of #42993 - stepancheg:editorconfig, r=brson

Add .editorconfig to src/rustllvm

... which uses 2 space indent instead of common 4 spaces.

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