[llvm] [ThinLTO]Record import type (declaration or definition) in GlobalValueSummary::GVFlags (PR #87597)

[Teresa Johnson via llvm-commits]

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@@ -472,14 +472,20 @@ class GlobalValueSummary {
     /// means the symbol was externally visible.
     unsigned CanAutoHide : 1;
 
+    /// This field is written by the ThinLTO indexing step to postlink
+    /// per-module summary. It indicates whether a global value (function or
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teresajohnson wrote:

"postlink per-module" doesn't make sense - per-module is always pre-thinlink. Just say in the post link combined summary (which we do shard out for distributed ThinLTO, but it is still the "combined index" format).

https://github.com/llvm/llvm-project/pull/87597