It's called suicide button and I'm not sure where it is, might not be released. Just search the forums for "Suicide Button"

EDIT: Here it is i found it, but next time use search

To use i think its either L+UP or R+UP

#SonniE's Sui Button
;Credit SonniE
;codinghs.COM
0x00449BD0 0x0E200180
0x00000600 0x00000000
0x00000604 0x3C0808E2
0x00000608 0x85089398
0x0000060C 0x3C0B3000
0x00000610 0x34190001
0x00000614 0x3C0908EE
0x00000618 0x340A0110
0x0000061C 0x150A0003
0x00000620 0x00000000
0x00000624 0x8D29B978
0x00000628 0xAD2B0390
0x0000062C 0x03E00008
0x00000630 0x0E3127FD