Optimize int === int/double === double

Do this by reusing the implementation used for `==`
when both arguments are ints (IS_LONG) or both are floats (IS_DOUBLE)

```php
// Before: nestedloop_ni took 0.442 seconds
// After: nestedloop_ni takes 0.401 seconds (same as nestedloop_ne)
function nestedloop_ni(int $k) {
  $x = 0;
  for ($i=0; $i < 50000000; $i++) {
    if ($i === $k) {
      $x++;
    }
  }
  print "$x\n";
}
function nestedloop_ne(int $k) {
  $x = 0;
  for ($i=0; $i < 50000000; $i++) {
    if ($i == $k) {
        $x++;
    }
  }
  print "$x\n";
}
```

Author: TysonAndre

Zend/zend_vm_execute.h

@@ -59194,6 +59194,7 @@ ZEND_API void ZEND_FASTCALL zend_vm_set_opcode_handler_ex(zend_op* op, uint32_t
 			}
 			break;
 		case ZEND_IS_EQUAL:
+		case ZEND_IS_IDENTICAL:
 			if (op->op1_type < op->op2_type) {
 				zend_swap_operands(op);
 			}
@@ -59210,6 +59211,7 @@ ZEND_API void ZEND_FASTCALL zend_vm_set_opcode_handler_ex(zend_op* op, uint32_t
 			}
 			break;
 		case ZEND_IS_NOT_EQUAL:
+		case ZEND_IS_NOT_IDENTICAL:
 			if (op->op1_type < op->op2_type) {
 				zend_swap_operands(op);
 			}
@@ -59330,8 +59332,6 @@ ZEND_API void ZEND_FASTCALL zend_vm_set_opcode_handler_ex(zend_op* op, uint32_t
 		case ZEND_BW_AND:
 		case ZEND_BW_XOR:
 		case ZEND_BOOL_XOR:
-		case ZEND_IS_IDENTICAL:
-		case ZEND_IS_NOT_IDENTICAL:
 			if (op->op1_type < op->op2_type) {
 				zend_swap_operands(op);
 			}

Zend/zend_vm_gen.php

@@ -2818,6 +2818,13 @@ function gen_vm($def, $skel) {
 				if (isset($dsc['type_spec'])) {
 					$orig_op = $dsc['op'];
 					out($f, "\t\tcase $orig_op:\n");
+					// XXX: Copy the specializations for LONG == LONG and DOUBLE != DOUBLE to work for ===/!== as well.
+					// (Those are currently the only specializations)
+					if ($orig_op === 'ZEND_IS_EQUAL') {
+						out($f, "\t\tcase ZEND_IS_IDENTICAL:\n");
+					} elseif ($orig_op === 'ZEND_IS_NOT_EQUAL') {
+						out($f, "\t\tcase ZEND_IS_NOT_IDENTICAL:\n");
+					}
 					if (isset($dsc["spec"]["COMMUTATIVE"])) {
 						out($f, "\t\t\tif (op->op1_type < op->op2_type) {\n");
 						out($f, "\t\t\t\tzend_swap_operands(op);\n");
@@ -2857,8 +2864,10 @@ function gen_vm($def, $skel) {
 				    !isset($dsc['type_spec']) &&
 				    isset($dsc["spec"]["COMMUTATIVE"])) {
 					$orig_op = $dsc['op'];
-					out($f, "\t\tcase $orig_op:\n");
-					$has_commutative = true;
+					if (!in_array($orig_op, ['ZEND_IS_IDENTICAL', 'ZEND_IS_NOT_IDENTICAL'])) {
+						out($f, "\t\tcase $orig_op:\n");
+						$has_commutative = true;
+					}
 				}
 			}
 			if ($has_commutative) {