Fix inconsistent ray payloads in RT barrier tests

Ray payload declarations (outgoing and incoming) were not consistent
across all ray shader stages in the ray tracing pipeline barrier tests.

In addition, this commit fixes payload and callable data names to make
it clear they are not used.

Affected tests:
dEQP-VK.ray_tracing_pipeline.barrier.*

VK-GL-CTS issue: 2900
Components: Vulkan

Change-Id: If764cf3cde9effb5868a7c03a0b2200cf9d90cb8
diff --git a/external/vulkancts/modules/vulkan/ray_tracing/vktRayTracingBarrierTests.cpp b/external/vulkancts/modules/vulkan/ray_tracing/vktRayTracingBarrierTests.cpp
index 3ab2874..e84bfe7 100644
--- a/external/vulkancts/modules/vulkan/ray_tracing/vktRayTracingBarrierTests.cpp
+++ b/external/vulkancts/modules/vulkan/ray_tracing/vktRayTracingBarrierTests.cpp
@@ -489,7 +489,7 @@
 		ahit
 			<< "#version 460 core\n"
 			<< "#extension GL_EXT_ray_tracing : require\n"
-			<< "layout(location = 0) rayPayloadInEXT vec3 hitValue;\n"
+			<< "layout(location = 0) rayPayloadInEXT vec3 unusedPayload;\n"
 			<< "hitAttributeEXT vec3 attribs;\n"
 			<< writerResourceDecl.str()
 			<< "void main()\n"
@@ -508,7 +508,7 @@
 		chit
 			<< "#version 460 core\n"
 			<< "#extension GL_EXT_ray_tracing : require\n"
-			<< "layout(location = 0) rayPayloadInEXT vec3 hitValue;\n"
+			<< "layout(location = 0) rayPayloadInEXT vec3 unusedPayload;\n"
 			<< "hitAttributeEXT vec3 attribs;\n"
 			<< writerResourceDecl.str()
 			<< "void main()\n"
@@ -527,7 +527,7 @@
 		miss
 			<< "#version 460 core\n"
 			<< "#extension GL_EXT_ray_tracing : require\n"
-			<< "layout(location = 0) rayPayloadInEXT dummyPayload { vec4 dummy; };\n"
+			<< "layout(location = 0) rayPayloadInEXT vec3 unusedPayload;\n"
 			<< writerResourceDecl.str()
 			<< "void main()\n"
 			<< "{\n"
@@ -544,7 +544,7 @@
 			rgen
 				<< "#version 460 core\n"
 				<< "#extension GL_EXT_ray_tracing : require\n"
-				<< "layout(location = 0) callableDataEXT float dummy;"
+				<< "layout(location = 0) callableDataEXT float unusedCallableData;"
 				<< "layout(set = 0, binding = 1) uniform accelerationStructureEXT topLevelAS;\n"
 				<< "\n"
 				<< "void main()\n"
@@ -559,7 +559,7 @@
 		callable
 			<< "#version 460 core\n"
 			<< "#extension GL_EXT_ray_tracing : require\n"
-			<< "layout(location = 0) callableDataInEXT float dummy;\n"
+			<< "layout(location = 0) callableDataInEXT float unusedCallableData;\n"
 			<< writerResourceDecl.str()
 			<< "void main()\n"
 			<< "{\n"
@@ -665,7 +665,7 @@
 		ahit
 			<< "#version 460 core\n"
 			<< "#extension GL_EXT_ray_tracing : require\n"
-			<< "layout(location = 0) rayPayloadInEXT vec3 hitValue;\n"
+			<< "layout(location = 0) rayPayloadInEXT vec3 unusedPayload;\n"
 			<< "hitAttributeEXT vec3 attribs;\n"
 			<< readerAllDecls
 			<< "void main()\n"
@@ -684,7 +684,7 @@
 		chit
 			<< "#version 460 core\n"
 			<< "#extension GL_EXT_ray_tracing : require\n"
-			<< "layout(location = 0) rayPayloadInEXT vec3 hitValue;\n"
+			<< "layout(location = 0) rayPayloadInEXT vec3 unusedPayload;\n"
 			<< "hitAttributeEXT vec3 attribs;\n"
 			<< readerAllDecls
 			<< "void main()\n"
@@ -703,7 +703,7 @@
 		miss
 			<< "#version 460 core\n"
 			<< "#extension GL_EXT_ray_tracing : require\n"
-			<< "layout(location = 0) rayPayloadInEXT dummyPayload { vec4 dummy; };\n"
+			<< "layout(location = 0) rayPayloadInEXT vec3 unusedPayload;\n"
 			<< readerAllDecls
 			<< "void main()\n"
 			<< "{\n"
@@ -720,7 +720,7 @@
 			rgen
 				<< "#version 460 core\n"
 				<< "#extension GL_EXT_ray_tracing : require\n"
-				<< "layout(location = 0) callableDataEXT float dummy;"
+				<< "layout(location = 0) callableDataEXT float unusedCallableData;"
 				<< "layout(set = 0, binding = 1) uniform accelerationStructureEXT topLevelAS;\n"
 				<< "\n"
 				<< "void main()\n"
@@ -735,7 +735,7 @@
 		callable
 			<< "#version 460 core\n"
 			<< "#extension GL_EXT_ray_tracing : require\n"
-			<< "layout(location = 0) callableDataInEXT float dummy;\n"
+			<< "layout(location = 0) callableDataInEXT float unusedCallableData;\n"
 			<< readerAllDecls
 			<< "void main()\n"
 			<< "{\n"