radv: implement out-of-order rasterization when it's safe on VI+

Disabled by default for now, it can be enabled with
RADV_PERFTEST=outoforder.

No CTS regressions on Polaris, and all Vulkan games I tested
look good as well.

Expect small performance improvements for applications where
out-of-order rasterization can be enabled by the driver.

Loosely based on RadeonSI.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/vulkan/radv_debug.h

@@ -50,6 +50,7 @@ enum {
 	RADV_PERFTEST_SISCHED        =   0x2,
 	RADV_PERFTEST_LOCAL_BOS      =   0x4,
 	RADV_PERFTEST_BINNING     =   0x8,
+	RADV_PERFTEST_OUT_OF_ORDER   =  0x10,
 };
 
 bool