Enable occlusionQueryPrecise

Swiftshader already counts all the fragments for this feature, it just
needed to be enabled in VkPhysicalDevice.cpp. The occlusion_query tests
that remain unsupported require VK_EXT_host_query_reset. This is
unsupported in SwiftShader as of now, though it is required for Vulkan
1.2 conformance.

Bug: b/148241855
Tests: dEQP-VK.query_pool.occlusion_query.*
Change-Id: Ib03df4225ed49865c648368ebf0547bfc3d117f7
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/47148
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Sean Risser <srisser@google.com>

src/Vulkan/VkPhysicalDevice.cpp

diff --git a/src/Vulkan/VkPhysicalDevice.cpp b/src/Vulkan/VkPhysicalDevice.cpp
index 39b56e2..f53c326 100644
--- a/src/Vulkan/VkPhysicalDevice.cpp
+++ b/src/Vulkan/VkPhysicalDevice.cpp
@@ -91,7 +91,7 @@
 		VK_FALSE,  // textureCompressionASTC_LDR
 #endif
 		VK_TRUE,   // textureCompressionBC
-		VK_FALSE,  // occlusionQueryPrecise
+		VK_TRUE,   // occlusionQueryPrecise
 		VK_FALSE,  // pipelineStatisticsQuery
 		VK_TRUE,   // vertexPipelineStoresAndAtomics
 		VK_TRUE,   // fragmentStoresAndAtomics

src/Vulkan/VkQueryPool.cpp

diff --git a/src/Vulkan/VkQueryPool.cpp b/src/Vulkan/VkQueryPool.cpp
index b313620..2105608 100644
--- a/src/Vulkan/VkQueryPool.cpp
+++ b/src/Vulkan/VkQueryPool.cpp
@@ -192,7 +192,8 @@
 {
 	ASSERT(query < count);
 
-	if(flags != 0)
+	// Only accept flags with valid bits set.
+	if(flags & ~(VK_QUERY_CONTROL_PRECISE_BIT))
 	{
 		UNSUPPORTED("vkCmdBeginQuery::flags %d", int(flags));
 	}