[Utils] Add missing attributes in syntax files

Added the following attributes to all LLVM syntax files:
  * allocsize
  * cold
  * convergent
  * dereferenceable_or_null
  * hot
  * inaccessiblemem_or_argmemonly
  * inaccessiblememonly
  * inalloca
  * jumptable
  * nocallback
  * nocf_check
  * noduplicate
  * nofree
  * nomerge
  * noprofile
  * nosync
  * null_pointer_is_valid
  * optforfuzzing
  * preallocated
  * safestack
  * sanitize_hwaddress
  * sanitize_memtag
  * shadowcallstack
  * speculative_load_hardening
  * swifterror
  * syncscope
  * tailcc
  * willreturn

I generated that list by comparing:
  * Attributes.inc (generated from Attributes.td), and
  * the Vim syntax file: llvm/utils/vim/syntax/llvm.vim

My original intention was to focus on the Vim syntax file. Since other
syntax files are also out-of-date, I added these attributes (if missing)
to other files as well. Note that in the other sytnax files (i.e. for
Emacs, VScode and Kate), there will be other attributes missing too.

I've a...