Show bad fingerprint.

Author: David Ungar

lib/AST/FineGrainedDependencyFormat.cpp

@@ -234,7 +234,7 @@ bool Deserializer::readFineGrainedDependencyGraph(SourceFileDepGraph &g,
       if (auto fingerprint = Fingerprint::fromString(BlobData))
         node->setFingerprint(fingerprint.getValue());
       else
-        llvm::report_fatal_error("Unconvertable FINGERPRINT_NODE record");
+        llvm::report_fatal_error(Twine("Unconvertable FINGERPRINT_NODE record: '") + BlobData + "'" );
       break;
     }
 

lib/Serialization/ModuleFileCoreTableInfo.h

@@ -604,7 +604,7 @@ class ModuleFileSharedCore::DeclFingerprintsTableInfo {
                                Fingerprint::DIGEST_LENGTH};
     if (auto fp = Fingerprint::fromString(str))
       return fp.getValue();
-    llvm::errs() << "Unconvertable fingerprint\n";
+    llvm::errs() << "Unconvertable fingerprint '" << str << "'\n";
     abort();
   }
 };