[llvm-pdbutil] Dig deeper into the PDB and DBI streams when explaining.

This will show more detail when using `llvm-pdbutil explain` on an
offset in the DBI or PDB streams.  Specifically, it will dig into
individual header fields and substreams to give a more precise
description of what the byte represents.

llvm-svn: 328878
diff --git a/llvm/tools/llvm-pdbutil/llvm-pdbutil.h b/llvm/tools/llvm-pdbutil/llvm-pdbutil.h
index 6765b93..e7ad269 100644
--- a/llvm/tools/llvm-pdbutil/llvm-pdbutil.h
+++ b/llvm/tools/llvm-pdbutil/llvm-pdbutil.h
@@ -191,7 +191,7 @@
 
 namespace explain {
 extern llvm::cl::list<std::string> InputFilename;
-extern llvm::cl::opt<uint64_t> Offset;
+extern llvm::cl::list<uint64_t> Offsets;
 } // namespace explain
 }