Add disassembler to GP and PP compilers

[anarsoul]

It's pretty hard to catch bugs in codegeneration without a disassembler.

[yuq]

Lima has a disassemble tool here:
https://gitorious.org/open-gpu-tools/cwabbotts-open-gpu-tools

[anarsoul]

I know, but I'd like to have it integrated into mesa driver. It's not convenient to feed hex dump to this tool manually. I'll work on it once I'm done with textures.

[yuq]

Oh, that's great if we can directly disassemble the shader binary in the mesa.