Driver installation instruction

2019-5-24 update

New feature and improvement

• Enable VK_EXT_host_query_reset extension
• Enable VK_EXT_separate_stencil_usage extension
• Enable VK_KHR_uniform_buffer_standard_layout extension
• Reduce optimizations run by llpc
• Support merge ELF binary for per stage cache and enable per-stage-shader cache
• Remove ETC2 support from GFXIP 8.1
• Update api_version to 1.1.108

Issue fix

• DiRT Rally 2.0 corruption
• DiRT 4 flickering
• Block corruption in Witcher3
• DiRT Rally 2.0 hang with ultra settings
• dEQP-VK.binding_model.descriptorset_random.sets32.unifindexed.ubolimithigh.sbolimitlow.imglimithigh.noiub.frag.0 failure