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nvk: Fix regression observed on Kepler

maurossi requested to merge issor.oruam/mesa:ldc_nv_kepler into main

vkcube, vkgears and vkmark are crashing with the following error/segfault:

$ NVK_I_WANT_A_BROKEN_VULKAN_DRIVER=1 vkcube
WARNING: NVK is not a conformant Vulkan implementation, testing use only.
Selected GPU 0: GeForce GT 640 (NVK GK107), type: DiscreteGpu
ERROR: couldn't get DataFile for op ldc_nv
Segmentation fault (core dumped)

Handling nir_intrinsic_ldc_nv as per nir_intrinsic_load_ubo in Converter::getFile()

allows to run vkcube, vkgears and vkmark on Nvidia GT640

Fixes: dc99d9b2 ("nvk,nak: Switch to nir_intrinsic_ldc_nv")

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