i965: Add INTEL_DEBUG=tcs,tes and hs,ds flags for tessellation shaders.

Even though both tessellation shader stages must be used together, I
still think it makes sense to add separate debug flags for each stage.
It makes it possible to read the TCS/HS, rule out problems, then read
the TES/DS separately, without sifting through as much printed text.

I decided to add both the GL names (tcs/tes) and hardware names (hs/ds)
so they can be used interchangeably.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>

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

@@ -75,6 +75,10 @@ static const struct debug_control debug_control[] = {
    { "cs",          DEBUG_CS },
    { "hex",         DEBUG_HEX },
    { "nocompact",   DEBUG_NO_COMPACTION },
+   { "hs",          DEBUG_TCS },
+   { "tcs",         DEBUG_TCS },
+   { "ds",          DEBUG_TES },
+   { "tes",         DEBUG_TES },
    { NULL,    0 }
 };
 
@@ -83,8 +87,8 @@ intel_debug_flag_for_shader_stage(gl_shader_stage stage)
 {
    uint64_t flags[] = {
       [MESA_SHADER_VERTEX] = DEBUG_VS,
-      [MESA_SHADER_TESS_CTRL] = 0,
-      [MESA_SHADER_TESS_EVAL] = 0,
+      [MESA_SHADER_TESS_CTRL] = DEBUG_TCS,
+      [MESA_SHADER_TESS_EVAL] = DEBUG_TES,
       [MESA_SHADER_GEOMETRY] = DEBUG_GS,
       [MESA_SHADER_FRAGMENT] = DEBUG_WM,
       [MESA_SHADER_COMPUTE] = DEBUG_CS,