glsl/linker: produce gl_shader_program Geom.Invocations

Grab the parsed invocation count, check for consistency
during linking, and finally save the result in
gl_shader_program Geom.Invocations.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>

src/glsl/glsl_parser_extras.cpp

@@ -1374,6 +1374,10 @@ set_shader_inout_layout(struct gl_shader *shader,
       } else {
          shader->Geom.OutputType = PRIM_UNKNOWN;
       }
+
+      shader->Geom.Invocations = 0;
+      if (state->in_qualifier->flags.q.invocations)
+         shader->Geom.Invocations = state->in_qualifier->invocations;
       break;
 
    case MESA_SHADER_COMPUTE: