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libdtracy: wrong operator in XORI (thanks aiju)

--- a/sys/src/libdtracy/prog.c

+++ b/sys/src/libdtracy/prog.c

@@ -138,7 +138,7 @@

 		case DTE_XOR: R[c] = R[a] ^ R[b]; break;

 		case DTE_XNOR: R[c] = ~(R[a] ^ R[b]); break;

 		case DTE_LDI: R[c] = (s64int)ins << 40 >> 54 << (ins >> 8 & 63); break;

-		case DTE_XORI: R[c] |= (s64int)ins << 40 >> 54 << (ins >> 8 & 63); break;

+		case DTE_XORI: R[c] ^= (s64int)ins << 40 >> 54 << (ins >> 8 & 63); break;

 		case DTE_LSL:

 			if((u64int)R[b] >= 64)

 				R[c] = 0;