8357999: SA: FileMapInfo.metadataTypeArray initialization issue after JDK-8355003

Reviewed-by: ayang, iklam, kvn, sspitsyn

Author: shipilev

src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/memory/FileMapInfo.java

@@ -126,7 +126,7 @@ private static void populateMetadataTypeArray(TypeDataBase db) {
     metadataTypeArray[4] = db.lookupType("InstanceRefKlass");
     metadataTypeArray[5] = db.lookupType("InstanceStackChunkKlass");
     metadataTypeArray[6] = db.lookupType("Method");
-    metadataTypeArray[9] = db.lookupType("MethodData");
+    metadataTypeArray[7] = db.lookupType("MethodData");
     metadataTypeArray[8] = db.lookupType("MethodCounters");
     metadataTypeArray[9] = db.lookupType("ObjArrayKlass");
     metadataTypeArray[10] = db.lookupType("TypeArrayKlass");