[svn r376] Fix bug with finally blocks and labels. The labels would get emitted multiple times and conflict.

It is now possible to add label scopes in IrFunction and all labels names will be prefixed accordingly.

Also disallow goto into finally blocks.

Fixes nocompile/finally_02 and others.

ir/irlandingpad.cpp

@@ -150,7 +150,12 @@ void IRLandingPad::constructLandingPad(llvm::BasicBlock* inBB)
         {
             if(switchinst)
                 switchinst = NULL;
+
+            // since this may be emitted multiple times
+            // give the labels a new scope
+            gIR->func()->pushUniqueLabelScope("finally");
             it->finallyBody->toIR(gIR);
+            gIR->func()->popLabelScope();
         }
         // otherwise it's a catch and we'll add a switch case
         else