[clang] Patch series to reapply #118734 and substantially improve it (PR #120534)

[Chandler Carruth via cfe-commits]

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@@ -112,6 +112,16 @@ static constexpr std::array<Info, N> MakeInfos(std::array<Info, N> Infos) {
   return Infos;
 }
 
+/// A shard of a target's builtins string table and info.
+///
+/// Target builtins are sharded across multiple tables due to different
+/// structures, origins, and also to improve the overall scaling by avoiding a
+/// single table across all builtins.
+struct InfosShard {
+  const llvm::StringTable *Strings;
+  llvm::ArrayRef<Info> Infos;
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chandlerc wrote:

(As discussed elsewhere, yep.)

https://github.com/llvm/llvm-project/pull/120534