freedreno/ir3: Add ir3 intrinsics for tessellation

These provide the iovas for system memory buffers used for
tessellation as well as a new HW specific system value.

Signed-off-by: Kristian H. Kristensen <hoegsberg@google.com>
Acked-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Rob Clark <robdclark@gmail.com>

src/compiler/shader_enums.h

@@ -642,11 +642,12 @@ typedef enum
    SYSTEM_VALUE_BARYCENTRIC_SIZE,
 
    /**
-    * IR3 specific geometry shader system value that packs invocation id,
-    * thread id and vertex id.  Having this as a nir level system value lets
-    * us do the unpacking in nir.
+    * IR3 specific geometry shader and tesselation control shader system
+    * values that packs invocation id, thread id and vertex id.  Having this
+    * as a nir level system value lets us do the unpacking in nir.
     */
    SYSTEM_VALUE_GS_HEADER_IR3,
+   SYSTEM_VALUE_TCS_HEADER_IR3,
 
    SYSTEM_VALUE_MAX             /**< Number of values */
 } gl_system_value;