glsl: Use bit-flags image attributes and uint16_t for the image format

All of the GL image enums fit in 16-bits.

Also move the fields from the anonymous "image" structucture to the next
higher structure.  This will enable packing the bits with the other
bitfield.

Valgrind massif results for a trimmed apitrace of dota2:

                  n        time(i)         total(B)   useful-heap(B) extra-heap(B)    stacks(B)
Before (32-bit): 76 40,572,916,873       68,831,248       63,328,783     5,502,465            0
After  (32-bit): 70 40,577,421,777       68,487,584       62,973,695     5,513,889            0

Before (64-bit): 60 36,822,640,058       96,526,824       88,735,296     7,791,528            0
After  (64-bit): 74 37,124,603,758       95,891,808       88,466,712     7,425,096            0

A real savings of 346KiB on 32-bit and 262KiB on 64-bit.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

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