radv: add a new debug option called RADV_DEBUG=noshaderballot

Shader ballot will be enabled by default for Wolfenstein
Youngblood. This follows what we did for sisched.

Cc: 19.2 <mesa-stable@lists.freedesktop.org
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/vulkan/radv_debug.h

@@ -53,6 +53,7 @@ enum {
 	RADV_DEBUG_NOBINNING         = 0x800000,
 	RADV_DEBUG_NO_LOAD_STORE_OPT = 0x1000000,
 	RADV_DEBUG_NO_NGG            = 0x2000000,
+	RADV_DEBUG_NO_SHADER_BALLOT  = 0x4000000,
 };
 
 enum {

src/amd/vulkan/radv_device.c

@@ -496,6 +496,7 @@ static const struct debug_control radv_debug_options[] = {
 	{"nobinning", RADV_DEBUG_NOBINNING},
 	{"noloadstoreopt", RADV_DEBUG_NO_LOAD_STORE_OPT},
 	{"nongg", RADV_DEBUG_NO_NGG},
+	{"noshaderballot", RADV_DEBUG_NO_SHADER_BALLOT},
 	{NULL, 0}
 };