Handle global variables correctly.

llvm-svn: 2571

 * Use binary operator logic for shifts instead of cloning code
 * Unary not is '~' not '!'

llvm-svn: 2570

have some hope of working right.

Function calls do not try to emit an lvalue if they return void.

llvm-svn: 2569

It turns out that unnamed values DO NOT work at all, that's next on the list.

llvm-svn: 2568

llvm-svn: 2567

llvm-svn: 2552