[clang] [C++20][Modules] Load function body from the module that gives canonical decl (PR #111992)

[Chuanqi Xu via cfe-commits]

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@@ -10057,15 +10057,18 @@ void ASTReader::finishPendingActions() {
       // For a function defined inline within a class template, force the
       // canonical definition to be the one inside the canonical definition of
       // the template. This ensures that we instantiate from a correct view
-      // of the template.
+      // of the template. This behaviour seems to be important only for inline
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ChuanqiXu9 wrote:

`seems` seems to not be a good term in comments.

https://github.com/llvm/llvm-project/pull/111992