[svn r18] * Initial support for switch statements - No string switches yet. * Moved Statement::toIR definitions into gen/statements.c - toir.c is still too big. * Removed some BB bloat with ScopeStatements.

module switch1;

void main()
{
    int i = 2;
    int r;
    switch (i)
    {
    case 1: r+=1; break;
    case 2: r-=2;
    case 3: r=3; break;
    default: r=-1;
    }
    assert(r == 3);
}