Issue #426 part 2. Generate a try-finally block only if it is required

(i.e. there are actually some destructor calls that are needed to be put into finally)

gen/llvmhelpers.cpp

@@ -1055,7 +1055,7 @@ void DtoVarDeclaration(VarDeclaration* vd)
                         {
                             vd->ir.irLocal->value = val;
                         }
-                        goto Lexit;
+                        return;
                     }
                 }
             }
@@ -1087,15 +1087,6 @@ void DtoVarDeclaration(VarDeclaration* vd)
             ex->exp->toElem(gIR);
         }
     }
-
-Lexit:
-    /* Mark the point of construction of a variable that needs to be destructed.
-     */
-    if (vd->edtor && !vd->noscope)
-    {
-        // Put vd on list of things needing destruction
-        gIR->varsInScope().push_back(vd);
-    }
 }
 
 DValue* DtoDeclarationExp(Dsymbol* declaration)