[Piglit] [PATCH 0/5] Add int64 conversion tests

[Nicolai Hähnle]

Hi all,

increase the test coverage of GL_ARB_gpu_shader_int64 by testing various
conversions. To avoid reinventing the wheel or duplicating code, I've
extended the existing fp64 conversion test generation. The first couple
of patches simply move code around and rename things. The last patch adds
all the actual int64 tests.

I verified using diff that the existing generated test files remain
unmodified. The only change is that more test files are generated in
spec/arb_gpu_shader_int64. Tested against radeonsi with the remaining
patches that I'm about to send to mesa-dev. Please review!

Thanks,
Nicolai