[clang-tools-extra] [clangd] [C++20] [Modules] Support code complete for C++20 modules (PR #110083)

[Chuanqi Xu via cfe-commits]

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@@ -2108,7 +2116,7 @@ class CodeCompleteFlow {
 
 } // namespace
 
-clang::CodeCompleteOptions CodeCompleteOptions::getClangCompleteOpts() const {
+clang::CodeCompleteOptions CodeCompleteOptions::getClangCompleteOpts(bool ForceLoadExternal) const {
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ChuanqiXu9 wrote:

I found the `CodeCompleteOptions` are passing to `codeComplete`. So if we pass the information if modules are enabled when initialize `clangd::CodeCompleteOptions`, we may need to update all the places using `clangd::CodeCompleteOptions`. I feel it is bigger but unnecessary change. I don't feel bad with the current style. WDYT? 

https://github.com/llvm/llvm-project/pull/110083