Count number of Crystals on map

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0007a774: 3c03800a lui r3,0x800a			
0007a778: 8c638a54 lw r3,-0x75ac(r3)			Load Misc Unit Display Data 
0007a77c: 00000000 nop
0007a780: 1060000b beq r3,r0,0x0007a7b0			Branch if Misc Unit Display Data  == 0x0
0007a784: 00002021 addu r4,r0,r0
0007a788: 3405009b ori r5,r0,0x009b			r5 = crystal spritesheet
0007a78c: 90620006 lbu r2,0x0006(r3)			Load Spritesheet ID
0007a790: 00000000 nop
0007a794: 14450002 bne r2,r5,0x0007a7a0			Branch if Spritesheet is crystal
0007a798: 00000000 nop
0007a79c: 24840001 addiu r4,r4,0x0001			++
0007a7a0: 8c630000 lw r3,0x0000(r3)			Load Pointer to previous unit's misc data (00000000 means this is the first)
0007a7a4: 00000000 nop
0007a7a8: 1460fff8 bne r3,r0,0x0007a78c			Branch if Pointer to previous unit's misc data (00000000 means this is the first),  != 0x0
0007a7ac: 00000000 nop
0007a7b0: 03e00008 jr r31			Jump to Address
0007a7b4: 00801021 addu r2,r4,r0		Return number of crystals on map
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