[clang-tools-extra] [clangd] Add feature modules registry (PR #153756)

[kadir çetinkaya via cfe-commits]

================
@@ -9,6 +9,8 @@
 #include "FeatureModule.h"
 #include "support/Logger.h"
 
+LLVM_INSTANTIATE_REGISTRY(clang::clangd::FeatureModuleRegistry)
----------------
kadircet wrote:

nit: can you move this to the bottom of the file instead?

https://github.com/llvm/llvm-project/pull/153756