arm: alias LDR instruction with operands '[sp], 4' to POP. suggested by Pancake

arch/ARM/ARMInstPrinter.c

@@ -469,8 +469,11 @@ void ARM_printInst(MCInst *MI, SStream *O, void *Info)
 						break;
 
 		case ARM_LDR_POST_IMM:
-						if (MCOperand_getReg(MCInst_getOperand(MI, 2)) == ARM_SP &&
-								MCOperand_getImm(MCInst_getOperand(MI, 4)) == 4) {
+						if (MCOperand_getReg(MCInst_getOperand(MI, 2)) == ARM_SP) {
+							MCOperand *MO2 = MCInst_getOperand(MI, 4);
+							if ((getAM2Op((unsigned int)MCOperand_getImm(MO2)) == ARM_AM_add &&
+										getAM2Offset((unsigned int)MCOperand_getImm(MO2)) == 4) ||
+									MCOperand_getImm(MO2) == 4) {
 								SStream_concat0(O, "pop");
 								MCInst_setOpcodePub(MI, ARM_INS_POP);
 								printPredicateOperand(MI, 5, O);
@@ -484,6 +487,7 @@ void ARM_printInst(MCInst *MI, SStream *O, void *Info)
 								SStream_concat0(O, "}");
 								return;
 							}
+						}
 						break;
 
 						// A8.6.355 VPUSH