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

[Teresa Johnson via llvm-commits]

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@@ -564,6 +581,12 @@ class GlobalValueSummary {
 
   bool canAutoHide() const { return Flags.CanAutoHide; }
 
+  bool shouldImportAsDec() const {
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teresajohnson wrote:

Suggest s/Dec/Decl/ (Decl is a bit more typical as an abbreviation)

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