Ignore 'this' by checking the name of the variable

Fix #179, Missing variables when debugging Android apps

- While getting the list of variables for a method, we were skipping the first slot assuming it was a reference to this.
- Though that is not always the case when testing with Android dex files.
- Instead of assuming `this` is at the first slot, check the name of the variable.

org.eclipse.jdt.debug/jdi/org/eclipse/jdi/internal/MethodImpl.java

@@ -561,9 +561,7 @@ public List<LocalVariable> variables() throws AbsentInformationException {
 				int slot = readInt("slot", replyData); //$NON-NLS-1$
 				boolean isArgument = slot < fArgumentSlotsCount;
 
-				// Note that for instance methods, the first slot contains the
-				// this reference.
-				if (isStatic() || slot > 0) {
+				if (!name.equals("this")) { //$NON-NLS-1$
 					LocalVariableImpl localVar = new LocalVariableImpl(
 							virtualMachineImpl(), this, codeIndex, name,
 							signature, genericSignature, length, slot,