PVS-Studio warning V610 for MAME

UINT32 m_color1_mask;
UINT32 m_color2_mask;

#define ARRAY_LENGTH(x) (sizeof(x) / sizeof(x[0]))

PALETTE_INIT( montecar )
{
 static const UINT8 colortable_source[] =
 {
  0x00, 0x00, 0x00, 0x01,
  0x00, 0x02, 0x00, 0x03,
  0x03, 0x03, 0x03, 0x02,
  0x03, 0x01, 0x03, 0x00,
  0x00, 0x00, 0x02, 0x00,
  0x02, 0x01, 0x02, 0x02,
  0x00, 0x10, 0x20, 0x30,
  0x00, 0x04, 0x08, 0x0c,
  0x00, 0x44, 0x48, 0x4c,
  0x00, 0x84, 0x88, 0x8c,
  0x00, 0xc4, 0xc8, 0xcc
 };
  ...
 for (i = 0; i < ARRAY_LENGTH(colortable_source); i++)
 {
  UINT8 color = colortable_source[i];

  if (color == 1)
   state->m_color1_mask |= 1 << i;                  <<<---
  else if (color == 2)
   state->m_color2_mask |= 1 << i;                  <<<---

  prom_to_palette(machine, i,
    color_prom[0x100 + colortable_source[i]]);
 }
  ...
}

This suspicious code was found in MAME project by PVS-Studio static code analyzer.
Warning message is:
V610 Undefined behavior. Check the shift operator '<<. The right operand ('i' = [0..43]) is greater than or equal to the length in bits of the promoted left operand.  firetrk.c 111

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