* Update release number to 124.
Github Issues:
* Fix Makefile SPECREMARK macro to work when not building in a git tree
(public issue 992).
* Ignore pname:aspectMask for unused attachments in
slink:VkSubpassDescription2KHR valid usage statements (public pull
request 1028).
* Minor markup / spelling fixes (public pull requests 1035, 1045).
Internal Issues:
* Fix markup in Valid Usage statement for slink:VkCreateFramebuffer
(internal issue 1823).
* Add a new <<synchronization-signal-operation-order, _signal operation
order_>> section to the synchronization chapter which describes in
detail the ordering guarantees provided by the API between fence and
semaphore signal operations (internal merge request 3368).
* Move generated `appendix/meta/` files into the Makefile GENERATED
directory (internal merge request 3381).
New Extensions
* `<<VK_KHR_shader_clock>>`
* `<<VK_KHR_timeline_semaphore>>`
* Update release number to 113.
Github Issues:
* Fix typo in `<<VK_EXT_global_priority>>` appendix (public issue 979).
Internal Issues:
* Expand the explanation of
slink:VkSamplerYcbcrConversionImageFormatPropertiesKHR::pname:combinedImageSamplerDescriptorCount,
and explain how it interacts with slink:VkWriteDescriptorSet,
slink:VkDescriptorSetLayoutBinding::pname:descriptorCount, and
slink:VkDescriptorPoolSize::pname:descriptorCount (internal issue 1643).
* Clarify restrictions on components for code:OpImageGather in the
<<spirvenv-module-validation, Validation Rules within a Module>> section
(internal issue 1707).
* Clarify the descriptions of <<limits-computeUnitsPerShaderArray,
pname:computeUnitsPerShaderArray>> and <<limits-wavefrontSize,
pname:wavefrontSize>> fields in
slink:VkPhysicalDeviceShaderCorePropertiesAMD.
New Extensions:
* `<<VK_EXT_texel_buffer_alignment>>`
* `<<VK_EXT_shader_demote_to_helper_invocation>>`
