Write stencil early when using earlyFragmentTests

The writeStencil() operation should happen early when using
earlyFragmentTests, so this CL allows this operation to happen
right after the early depth test.

Tests: dEQP-VK.fragment_operations.early_fragment.discard_early_fragment_tests_stencil
Bug: b/200826740
Change-Id: Ibfead3d9731c052b954c9d448de8dea5bb108316
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/66151
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Presubmit-Ready: Alexis Hétu <sugoi@google.com>

src/Pipeline/PixelRoutine.cpp

diff --git a/src/Pipeline/PixelRoutine.cpp b/src/Pipeline/PixelRoutine.cpp
index 7fb54d4..7ca20f5 100644
--- a/src/Pipeline/PixelRoutine.cpp
+++ b/src/Pipeline/PixelRoutine.cpp
@@ -129,6 +129,8 @@
 				depthPass = depthPass || depthTest(zBuffer, q, x, z[q], sMask[q], zMask[q], cMask[q]);
 				depthBoundsTest(zBuffer, q, x, zMask[q], cMask[q]);
 			}
+
+			writeStencil(sBuffer, x, sMask, zMask, cMask, samples);
 		}
 
 		If(depthPass || !earlyFragmentTests)
@@ -318,7 +320,10 @@
 			}
 		}
 
-		writeStencil(sBuffer, x, sMask, zMask, cMask, samples);
+		if(!earlyFragmentTests)
+		{
+			writeStencil(sBuffer, x, sMask, zMask, cMask, samples);
+		}
 	}
 }