hokein added inline comments.

================
Comment at: clang-tools-extra/clangd/index/CanonicalIncludes.cpp:780
+  // Prefer a mapping from the system symbols.
+  if (SystemSymbols) {
+    if (auto Result = SystemSymbols->mapHeader(Header, QualifiedName))
----------------
what's the interesting case where `SystemSymbols` is null?
I think it should be fine to always use the standard symbol mapping here? just 
use `getStandardSymbolMapping()->mapHeader()`, this would help to simplify the 
CanonicalInclude interface (no `addSystemHeadersMapping` and `SystemSymbols` 
members  are needed).


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D67172/new/

https://reviews.llvm.org/D67172



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