* Update release number to 112.
Github Issues:
* Clarify that it is possible to use the <<memory-host, Host Memory>>
pname:pfnReallocation callback to free memory in any case that
pname:pfnFree could be used (public issue 973).
Internal Issues:
* Clarify range and precision of code:OpImageQueryLod in the discussion of
scale factor and level-of-detail operation in the
<<textures-normalized-operations, Normalized Texel Coordinate
Operations>> section (internal issues 926, 1719).
* Fix framebuffer layer valid usage statements for
slink:VkRenderPassCreateInfo, slink:VkRenderPassCreateInfo2KHR, and
slink:VkFramebufferCreateInfo (internal issue 1670).
* Refactor common valid usage statements for flink:vkCmdBeginQuery and
flink:vkCmdBeginQueryIndexedEXT (internal issue 1682).
* Prohibit the ename:ename:VK_SAMPLER_YCBCR_RANGE_ITU_NARROW range from
being used in slink:VkSamplerYcbcrConversionCreateInfo for formats with
a bit depth less than 8 (internal issue 1688).
* Add missing interactions with `<<VK_EXT_host_query_reset_usage>>` in the
<<queries, Queries>> chapter (internal issue 1692).
* Clean up error output from the `optimize-pdf` build script on success.
* Fix an internal link to the <<spirvenv-correctly-rounded, Correctly
Rounded>> section in the SPIR-V appendix by adding and referring to that
anchor.
* Fix extension version numbers in `vk.xml` for `VK_EXT_filter_cubic` and
`VK_IMG_filter_cubic`.
* Specify division precision for negative numbers, and remove statement
that trigonometric functions have undefined precision, in the
<<spirvenv-precision-operation, Precision and Operation of SPIR-V
Instructions>> appendix.
Jon Leech