mesa: Track per-stage shader input and output limits independently

mesa: Track per-stage shader input and output limits independently

In OpenGL 3.2 these are independently queryable.  In addition, the spec
has different minimum-maximums for various values.
GL_MAX_VERTEX_OUTPUT_COMPONENTS is 64, but
GL_MAX_GEOMETRY_OUTPUT_COMPONENTS (and GL_MAX_FRAGMENT_INPUT_COMPONENTS)
is 128.

In OpenGL ES 3.0 these are also independently queryable.  The spec has
different minimum-maximums for various values.
GL_MAX_VERTEX_OUTPUT_VECTORS is 16, but GL_MAX_FRAGMENT_INTPUT_VECTORS
is 15.

None of these values are used yet.  I have just added space to the
structures.  Future patches will add users and eventually remove some
old fields.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
Cc: Zack Rusin <zackr@vmware.com>