v3d: Handle the line width intrinsics

Adds new QUNIFORMs to store the line widths.

v2: Also handle the aa_line_width intrinsic

Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5624>

src/broadcom/compiler/v3d_compiler.h

@@ -261,6 +261,13 @@ enum quniform_contents {
 
         QUNIFORM_ALPHA_REF,
 
+        QUNIFORM_LINE_WIDTH,
+
+        /* The line width sent to hardware. This includes the expanded width
+         * when anti-aliasing is enabled.
+         */
+        QUNIFORM_AA_LINE_WIDTH,
+
         /* Number of workgroups passed to glDispatchCompute in the dimension
          * selected by the data value.
          */