[svn r261] Fixed debug info for integer and floating local variables, can now be inspected in GDB. Did a lot of smaller cleans up here and there. Replaced more llvm::Foo with LLFoo for common stuff. Split up tollvm.cpp.

module imag1;

void main()
{
    ifloat f = 1.0i;
    auto x = 2.0i*f;
}