i965/vec4: Don't use GL types in the IR data structures.
i965/vec4: Don't use GL types in the IR data structures.

Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler