[llvm] [clang] [clang][DependencyScanner] Remove unused -ivfsoverlay files (PR #73734)

[Jan Svoboda via cfe-commits]

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@@ -9312,6 +9312,19 @@ SourceRange ASTReader::ReadSourceRange(ModuleFile &F, const RecordData &Record,
   return SourceRange(beg, end);
 }
 
+llvm::BitVector ASTReader::ReadBitVector(const RecordData &Record,
+                                         const StringRef Blob) {
+  llvm::BitVector Ret;
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jansvoboda11 wrote:

Can we drop this and turn the assignment to `Ret` below into a declaration?

https://github.com/llvm/llvm-project/pull/73734