Workaround for dEQP-VK.info.device_mandatory_features failure

VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SUBPASS_MERGE_FEEDBACK_FEATURES_EXT
is now queried when calling vkGetPhysicalDeviceFeatures2(), which
shouldn't happen unless the VK_EXT_subpass_merge_feedback extension
is exposed.

This CL works around this issue by handling this structure until the
issue is fixed.

Tests: dEQP-VK.info.*
Bug: b/216982034
Change-Id: I316c2348d724f23aedb2829ef6b1dbf70c4a6c92
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/67349
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

src/Vulkan/VkPhysicalDevice.cpp

diff --git a/src/Vulkan/VkPhysicalDevice.cpp b/src/Vulkan/VkPhysicalDevice.cpp
index f8ca0f0..dd648b4 100644
--- a/src/Vulkan/VkPhysicalDevice.cpp
+++ b/src/Vulkan/VkPhysicalDevice.cpp
@@ -583,6 +583,10 @@
 			// Workaround for a test bug (see https://gitlab.khronos.org/Tracker/vk-gl-cts/-/issues/3564)
 			reinterpret_cast<struct VkPhysicalDeviceTexelBufferAlignmentFeaturesEXT *>(curExtension)->texelBufferAlignment = VK_TRUE;
 			break;
+		case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SUBPASS_MERGE_FEEDBACK_FEATURES_EXT:
+			// TODO(b/216982034): Workaround for a test bug (see https://gitlab.khronos.org/Tracker/vk-gl-cts/-/issues/3879)
+			reinterpret_cast<struct VkPhysicalDeviceSubpassMergeFeedbackFeaturesEXT *>(curExtension)->subpassMergeFeedback = VK_FALSE;
+			break;
 		case VK_STRUCTURE_TYPE_MAX_ENUM:  // TODO(b/176893525): This may not be legal. dEQP tests that this value is ignored.
 			break;
 		default: