SPIRVLowering -> SPIRVOpLowering typo fix.
SPIRVLowering -> SPIRVOpLowering typo fix.

The MSVC compiler throws an error:
[build] C:\dev\iree\iree/compiler/Translation/SPIRV/XLAToSPIRV.h(57): error C2886: 'SPIRVLowering': symbol cannot be used in a member using-declaration

PiperOrigin-RevId: 285795282

iree-org/iree,google/iree,google/iree,iree-org/iree,iree-org/iree,google/iree,iree-org/iree,google/iree,google/iree,iree-org/iree,google/iree,iree-org/iree,iree-org/iree,google/iree