[Inline assembler] Sequential `asm` blocks and return via EAX

[Denis Shelomovskij]

1. Is there any guaranties that no code will be added between sequential 
inline assembler blocks, e.g.:
---
void f()
{
    static if(x)
        asm { mov EBX, 3; }
    else
        asm { mov EBX, 7; }
    asm { mov EAX, EBX; } // Is EBX value defined here?
}
---
Is it documented?


2. Such question about return via EAX (is the following use 
legal/documented):
---
int g()
{
    asm { mov EAX, 4; }
}
---
Such use of `asm` to return a value is used here and there in 
http://dlang.org/iasm.html