[clangd] Fix msan failure after r344735 by initializing bitfields

That revision changed integer members to bitfields; the integers were
default initialized before and the bitfields lost that default
initialization. This started causing msan use-of-uninitialized memory in
clangd tests.

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@344773 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed