glsl: Add image built-in function generator.

Because of the combinatorial explosion of different image built-ins
with different image dimensionalities and base data types, enumerating
all the 242 possibilities would be annoying and a waste of .text
space.  Instead use a special path in the built-in builder that loops
over all the known image types.

v2: Generate built-ins on GLSL version 4.20 too.  Rename
    '_has_float_data_type' to '_supports_float_data_type'.  Avoid
    duplicating enumeration of image built-ins in create_intrinsics()
    and create_builtins().
v3: Use a more orthodox approach for passing image built-in generator
    parameters.
v4: Cosmetic changes.

Acked-by: Paul Berry <[email protected]>

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