[clang] [clang] Do not serialize function definitions without a body (PR #121550)

[Alejandro Álvarez Ayllón via cfe-commits]

================
@@ -6092,9 +6092,10 @@ void ASTWriter::WriteDeclUpdatesBlocks(ASTContext 
&Context,
 
       // An updated body is emitted last, so that the reader doesn't need
       // to skip over the lazy body to reach statements for other records.
-      if (Kind == UPD_CXX_ADDED_FUNCTION_DEFINITION)
-        HasUpdatedBody = true;
-      else if (Kind == UPD_CXX_ADDED_VAR_DEFINITION)
+      if (Kind == UPD_CXX_ADDED_FUNCTION_DEFINITION) {
+        assert(isa<FunctionDecl>(D) && "expected FunctionDecl");
+        HasUpdatedBody = dyn_cast<FunctionDecl>(D)->hasBody();
+      } else if (Kind == UPD_CXX_ADDED_VAR_DEFINITION)
----------------
alejandro-alvarez-sonarsource wrote:

Added

https://github.com/llvm/llvm-project/pull/121550
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