[clang-tools-extra] [clangd] Add inlay hints for default function arguments and implicit lambda captures (PR #95712)

[Younan Zhang via cfe-commits]

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@@ -755,12 +807,34 @@ class InlayHintVisitor : public 
RecursiveASTVisitor<InlayHintVisitor> {
       bool NameHint = shouldHintName(Args[I], Name);
       bool ReferenceHint = shouldHintReference(Params[I], ForwardedParams[I]);
 
+      bool IsDefault = isa<CXXDefaultArgExpr>(Args[I]);
+      HasNonDefaultArgs |= !IsDefault;
+      if (Cfg.InlayHints.DefaultArguments && IsDefault) {
+        auto SourceText = Lexer::getSourceText(
+            CharSourceRange::getTokenRange(Params[I]->getDefaultArgRange()),
+            Callee.Decl->getASTContext().getSourceManager(),
+            Callee.Decl->getASTContext().getLangOpts());
----------------
zyn0217 wrote:

You don't have to query `Decl::getASTContext()` for the ASTContext, we have one 
in `InlayHintVisitor`.

https://github.com/llvm/llvm-project/pull/95712
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