i965: Remove has_aa_line_parameters.

This flag is only used in one place, and is only set on one platform.
Just check for original Gen4 in the relevant function.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/mesa/drivers/dri/i965/brw_context.c

@@ -440,7 +440,6 @@ brwCreateContext(gl_api api,
    if (brw->is_g4x || brw->gen >= 5) {
       brw->CMD_VF_STATISTICS = GM45_3DSTATE_VF_STATISTICS;
       brw->CMD_PIPELINE_SELECT = CMD_PIPELINE_SELECT_GM45;
-      brw->has_aa_line_parameters = true;
   } else {
       brw->CMD_VF_STATISTICS = GEN4_3DSTATE_VF_STATISTICS;
       brw->CMD_PIPELINE_SELECT = CMD_PIPELINE_SELECT_965;

src/mesa/drivers/dri/i965/brw_context.h

@@ -1055,7 +1055,6 @@ struct brw_context
    bool has_surface_tile_offset;
    bool has_compr4;
    bool has_negative_rhw_bug;
-   bool has_aa_line_parameters;
    bool has_pln;
 
    /**

src/mesa/drivers/dri/i965/brw_misc_state.c

@@ -838,7 +838,11 @@ static void upload_aa_line_parameters(struct brw_context *brw)
 {
    struct gl_context *ctx = &brw->ctx;
 
-   if (!ctx->Line.SmoothFlag || !brw->has_aa_line_parameters)
+   if (!ctx->Line.SmoothFlag)
+      return;
+
+   /* Original Gen4 doesn't have 3DSTATE_AA_LINE_PARAMETERS. */
+   if (brw->gen == 4 && !brw->is_g4x)
       return;
 
    if (brw->gen == 6)