[DWARF] Corrected behavior for when no .apple_names section is present in the object.
The verifier should not output any message in such a case.
Added test case with no .apple_name section in the file to verify new functionality.
Made existing test case more specific.

llvm-svn: 305597
diff --git a/llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp b/llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp
index a6240fb..41907e57 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp
@@ -279,7 +279,6 @@
 
 bool DWARFVerifier::handleAppleNames() {
   NumAppleNamesErrors = 0;
-  OS << "Verifying .apple_names...\n";
 
   DataExtractor AppleNamesSection(DCtx.getAppleNamesSection().Data,
                                   DCtx.isLittleEndian(), 0);
@@ -288,10 +287,11 @@
                                    DCtx.getAppleNamesSection().Relocs);
 
   if (!AppleNames.extract()) {
-    OS << "error: cannot extract .apple_names accelerator table\n";
-    return false;
+    return true;
   }
 
+  OS << "Verifying .apple_names...\n";
+
   // Verify that all buckets have a valid hash index or are empty
   uint32_t NumBuckets = AppleNames.getNumBuckets();
   uint32_t NumHashes = AppleNames.getNumHashes();