missing coverage for SPIR-V instruction OpImageQueryLod

We are currently missing coverage for the SPIR-V instruction OpImageQueryLod. Since this instruction is unlikely to be generated by any OpenCL C functions - there are no overloads for get_image_width() or get_image_height() that accept a LOD parameter, for example - this will likely need dedicated SPIR-V testing.

Two scenarios should be tested:

1. For all implementations supporting SPIR-V, for all supported image types, test OpImageQueryLod with "Level of Detail" equal to zero.
2. For all implementations supporting SPIR-V and `cl_khr_mipmap_image`, test OpImageQueryLod with a mipmap image, with "Level of Detail" ranging from zero to the number of mipmaps in the image.

* TBD: What is the expected behavior for out-of-range levels of detail?

Since testing (2) will likely be more complicated than (1), we should consider adding testing for (1) initially, then adding testing for (2) in a separate PR.

No file or test path is specified. Locate the existing SPIR-V instruction and image-query coverage, then start with the Level of Detail zero scenario for every supported image type and implementation; add the mipmap scenario separately if appropriate. Done means the requested implementations and image types are covered by dedicated tests.

Written by the indexing model from the issue text.