[clangd] Make binary index format the default, remove dead flag.
[clangd] Make binary index format the default, remove dead flag.

Reviewers: hokein

Subscribers: ilya-biryukov, ioeric, MaskRay, jkorous, arphaman, kadircet, cfe-commits

Differential Revision: https://reviews.llvm.org/D52872

git-svn-id: a34e9779ed74578ad5922b3306b3d80a0c825546@343841 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra