i965/fs: fix integer textures with swizzles
i965/fs: fix integer textures with swizzles

This happened to work before, but it would convert the output to a float
and then back to an integer which seems bad.

Signed-off-by: Connor Abbott <2f23645c6e5eadee787c1292fb09a35e9b9e7181@intel.com>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Chris Forbes <5dcac483e7a6e31a5cbe89f38cc69dff8ee93dac@ijw.co.nz>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler