dwarfdump: -summarize-types: print a short summary (unqualified type name, hash, length) of type units rather than dumping contents

This is just a quick utility handy for getting rough summaries of types
in a given object or dwo file. I've been using it to investigate the
amount of type info redundancy across a project build, for example.

llvm-svn: 284537
diff --git a/llvm/lib/DebugInfo/PDB/PDBContext.cpp b/llvm/lib/DebugInfo/PDB/PDBContext.cpp
index 7732302..94b81ecf 100644
--- a/llvm/lib/DebugInfo/PDB/PDBContext.cpp
+++ b/llvm/lib/DebugInfo/PDB/PDBContext.cpp
@@ -29,8 +29,8 @@
     Session->setLoadAddress(ImageBase.get());
 }
 
-void PDBContext::dump(raw_ostream &OS, DIDumpType DumpType,
-                      bool DumpEH) {}
+void PDBContext::dump(raw_ostream &OS, DIDumpType DumpType, bool DumpEH,
+                      bool SummarizeTypes) {}
 
 DILineInfo PDBContext::getLineInfoForAddress(uint64_t Address,
                                              DILineInfoSpecifier Specifier) {