Convert switch to if-else conditions

[milenaaluisa]

Added the TransformSwitchToIf class which converts a switch statement like this:

int num = 1, a;

switch (num) {
    case 1:
        a = 10;
    default:
        a = 80;
        break;
    case 2:
        a = 20;
        break;
    case 3 ... 7:
        a = 30;
}

Into this:

int num = 1, a;

if (num == 1) 
    goto case_1;
else if (num == 2) 
    goto case_2;
else if (num >= 3 && num <= 7) 
    goto case_3_7;
else 
    goto case_default;

case_1:
    a = 10;
case_default:
    a = 80;
    goto switch_exit;
case_2:
    a = 20;
    goto switch_exit;
case_3_7:
    a = 30;
    
switch_exit:
;

Note:

• To avoid adding duplicate labels to the AST when dealing with multiple switch statements, the label name of the switch exit and case statement actually contains its astId (e.g: switch_exit_0x14fb5a5b0b8, case_0x14fb5a5b120)
• Since the switch statement of the given example is the last child of its parent node, an empty statement was inserted after the switch_exit label:

// ...

switch_exit:
;   // the empty statement