[bug] Unexpected optimization strategy (arm-none-eabi-gcc 15)

#include <stdint.h>
#include <stddef.h>

/**
 * Name:    CRC-32/MPEG-2  x32+x26+x23+x22+x16+x12+x11+x10+x8+x7+x5+x4+x2+x+1
 * Poly:    0x4C11DB7
 * Init:    0xFFFFFFF
 * Refin:   False
 * Refout:  False
 * Xorout:  0x0000000
 * Note:
 */
uint32_t crc32(const uint8_t *data, size_t length)
{
    uint8_t i;
    uint32_t crc = 0xffffffff; // Initial value
    while (length--) {
        crc ^= (uint32_t)(*data++) << 24;
        for (i = 0; i < 8; ++i) {
            if (crc & 0x80000000)
                crc = (crc << 1) ^ 0x04C11DB7;
            else
                crc <<= 1;
        }
    }
    return crc;
}

For this code, the Os/Oz option results in generating larger code than O3.

https://godbolt.org/z/MEqqK1q5T

Section size for -Os options

```

|     .text |    .data |     .bss |  .rodata |

|    44(+0) |    0(+0) |    0(+0) | 1024(+0) |

```


Section size for -O3 options
```

|     .text |    .data |     .bss |  .rodata |

|   104(+0) |    0(+0) |    0(+0) |    0(+0) |

```

The behavior is normal on gcc 10.3.1.