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compute_maxstack: add missing case for boxl

--- a/maxstack.inc

+++ b/maxstack.inc

@@ -2,14 +2,12 @@

 compute_maxstack(uint8_t *code, size_t len)

 {

 	uint8_t *ip = code+4, *end = code+len;

-	uint8_t op;

 	uint32_t i, n, sp = 0, maxsp = 0;

 	while(ip < end){

 		if((int32_t)sp > (int32_t)maxsp)

 			maxsp = sp;

-		op = *ip++;

-		switch(op){

+		switch(*ip++){

 		case OP_LOADA: case OP_LOADI8: case OP_LOADV: case OP_LOADG:

 			ip++; // fallthrough

 		case OP_LOADA0: case OP_LOADA1:

@@ -50,7 +48,7 @@

 		case OP_LOADVL: case OP_LOADGL: case OP_LOADAL:

 			sp++; // fallthrough

-		case OP_SETGL: case OP_SETAL: case OP_LARGC:

+		case OP_SETGL: case OP_SETAL: case OP_LARGC: case OP_BOXL:

 			SWAP_INT32(ip);

 			ip += 4;

 			break;