layers: Free pipeline state memory in vkDestroyPipeline
layers: Free pipeline state memory in vkDestroyPipeline

Pipeline states are allocated in vkCreateGraphicsPipelines and
vkCreateComputePipelines.

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools