[clang] [Clang] Instantiate functions from constant evaluation. (PR #205557)

[Daniel M. Katz via cfe-commits]

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@@ -579,6 +579,7 @@ features cannot lower the translation-unit ABI level;
   rather than to a declarator chunk. (#GH196982, #GH111463)
 
 #### Bug Fixes to C++ Support
+- Instantiate constexpr functions as needed before they are evaluated. (#GH73232) (#GH35052) (#GH100897)
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katzdm wrote:

Done. Currently no mention of a flag, since we currently have no flag :)

https://github.com/llvm/llvm-project/pull/205557