Rollup merge of #74239 - AdrianCX:master, r=cuviper
Rollup merge of #74239 - AdrianCX:master, r=cuviper

Update llvm-project to latest origin/rustc/10.0-2020-05-05 commit

which includes LVI segfault fix when building https://github.com/fortanix/rust-sgx/issues/267
And a few earlier commits.

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