Semicolon-less formatting can sometimes generate invalid code

[colinator27]

Describe the bug
When semicolons are disabled in the decompiler, it can sometimes produce code that cannot be compiled, or has different meaning.

To Reproduce
Example code that does this:

return a
(b ? c : d).e = 123

There's other cases of this too, such as some involving ({}), and ++/--.

Expected behavior
Semicolons should probably be forcibly inserted in these situations.