Fix name function expressions

Fix name function expressions

We should also insert those into the environment members if they have
a name and are part of an expression statement. Simple testcase
example:

try {
    function foo() { ... }
} catch (e) {}

Then foo should be visible as if it was declared outside of the try.

Change-Id: I8d23a28e1c4537d4f57f9cb0d559e6163e0fdef0
Reviewed-by: Lars Knoll <lars.knoll@digia.com>