xla

dd609695 - Replace device parsing by `GetVirtualDevice()` function call. (#9709)

Replace device parsing by `GetVirtualDevice()` function call. (#9709) This PR avoids parsing `SPMD:0` every time by calling `GetVirtualDevice()` instead of the parsing function. It also avoids calling the parsing function inside `GetVirtualDevice()`, creating a new instance directly. **Key Changes:** 1. `GetVirtualDevice()` simply creates a new `BackendDevice` of `SPMD` type 2. Replaced the multiple calls to `ParseDeviceString("SPMD:0")` by `GetVirtualDevice()`