[clang] [clang-tools-extra] [clangd] Collect comments from function definitions into the index (PR #67802)

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

Meanwhile, I thought of a fix for https://github.com/llvm/llvm-project/issues/108145 and submitted it as https://github.com/llvm/llvm-project/pull/108475.

If that's accepted, you should be able to drop the `ASTContext.cpp` changes from this patch.

https://github.com/llvm/llvm-project/pull/67802