Fix Fastmem on CPUs without MOVBE

The problem was that when BSWAP was used, UnsafeWriteRegToReg() returned
the address of that instead of the MOV.

Source/Core/Common/x64Analyzer.cpp

@@ -154,6 +154,7 @@ bool DisassembleMov(const unsigned char *codePtr, InstructionInfo *info)
 			info->immediate = *(u32*)codePtr;
 			codePtr += 4;
 			break;
+
 		case 8:
 			info->zeroExtend = true;
 			info->immediate = *(u32*)codePtr;