[clang-tools-extra] [clang-doc] Add a breadcrumb navigation bar (PR #173297)

[Paul Kirth via cfe-commits]

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@@ -321,6 +321,67 @@ serializeCommonAttributes(const Info &I, json::Object &Obj,
       Obj["Location"] =
           serializeLocation(Symbol->DefLoc.value(), RepositoryUrl);
   }
+
+  if (!I.Contexts.empty()) {
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ilovepi wrote:

The logic in this block seems mostly self contained, so lets split this up into some helper functions/methods. Maybe smth like `generateContext()` or `createHtmlRefCtxt()`?

https://github.com/llvm/llvm-project/pull/173297