Revert "Revert r311552: [Bash-autocompletion] Add support for static analyzer flags"

This reverts commit 7c46b80c022e18d43c1fdafb117b0c409c5a6d1e.

r311552 broke lld buildbot because I've changed OptionInfos type from
ArrayRef to vector. However the bug is fixed, so I'll commit this again.

llvm-svn: 311958