Read ikvm'ed symbol files

* Previously the debug header was read without using the
AddressOfRawData
* It seems that for ikvm'ed symbol files this AddressOfRawData
can be 0 so to keep backwards compatibility we can check if PointerToRawData
is 0 in case of empty headers
* Add functional test for this scenario which uses ikvm 7.1.4532.2
* To read the assebmly immediately we also need the IKVM.Runtime.dll

Mono.Cecil.PE/ImageReader.cs

@@ -350,7 +350,7 @@ void ReadDebugHeader ()
 					PointerToRawData = ReadInt32 (),
 				};
 
-				if (directory.AddressOfRawData == 0) {
+				if (directory.PointerToRawData == 0) {
 					entries [i] = new ImageDebugHeaderEntry (directory, Empty<byte>.Array);
 					continue;
 				}

symbols/pdb/Test/Mono.Cecil.Tests/PdbTests.cs

@@ -463,5 +463,17 @@ public void CreateMethodFromScratch ()
 
 			Assert.AreEqual ("temp", method.DebugInformation.Scope.Variables [0].Name);
 		}
+
+		[Test]
+		public void IkvmDllSymbolsMatch()
+		{
+			TestModule ("ikvm-test.dll", module => {
+				var type = module.GetType ("com.test.TestClass");
+				var method = type.GetMethod ("Foo");
+				Assert.NotNull (type);
+				Assert.NotNull (method);
+
+			}, readOnly: !Platform.HasNativePdbSupport, symbolReaderProvider: typeof (PdbReaderProvider), symbolWriterProvider: typeof (PdbWriterProvider));
+		}
 	}
 }