The USB_IRQHandler function is just a generic name for USB Host OHCI controller Interrupt Handler Routine. As different platforms have different predefined IRQ Handler routine names this function might not be called USB_IRQHandler. This function must call USB Host library function USBH_OHCI_IRQHandler() as this function handles USB Host OHCI controller specific interrupts. The USB_IRQHandler function is part of the RL-USB-Host Software Stack. You can modify this function to suit different microcontroller interrupt system. note - This function will need to be changed if OHCI controller is used on a chip that does not yet have a low level driver provided.
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