[Utils][vim] Highlight CHECK-EMPTY: & CHECK-COUNT: directives

[MaskRay]

Note, many prefixes are not called CHECK*...

[zsrkmyn]

In D101135#2715124, @MaskRay wrote:

Note, many prefixes are not called CHECK*...

Yea, but most directives with CHECK prefix are already highlighted. This patch just adds EMPTY and COUNT support.

[porglezomp]

Style nit on quote-vs-slash, but otherwise this looks good to me.

llvm/utils/vim/syntax/llvm.vim

237–238

Minor nit, I don't think there's any reason these patterns need to use quotes, they could be changed to slash to match all of the surrounding patterns

[zsrkmyn]

Would you mind helping me commit this patch if there's no further comment? Thanks :-)

llvm/utils/vim/syntax/llvm.vim

 syn match   llvmConstant /\<DW_VIRTUALITY_[a-z_]\+\>/
 syn match   llvmConstant /\<DIFlag[A-Za-z]\+\>/
 
 " Syntax-highlight lit test commands and bug numbers.
 syn match  llvmSpecialComment /;\s*PR\d*\s*$/
 syn match  llvmSpecialComment /;\s*REQUIRES:.*$/
 syn match  llvmSpecialComment /;\s*RUN:.*$/
 syn match  llvmSpecialComment /;\s*ALLOW_RETRIES:.*$/
 syn match  llvmSpecialComment /;\s*CHECK:.*$/
-syn match  llvmSpecialComment "\v;\s*CHECK-(NEXT|NOT|DAG|SAME|LABEL):.*$"
+syn match  llvmSpecialComment /;\s*CHECK-EMPTY:\s*$/
+syn match  llvmSpecialComment /\v;\s*CHECK-(NEXT|NOT|DAG|SAME|LABEL|COUNT-\d+):.*$/
 syn match  llvmSpecialComment /;\s*XFAIL:.*$/
 
 if version >= 508 || !exists("did_c_syn_inits")
   if version < 508
     let did_c_syn_inits = 1
     command -nargs=+ HiLink hi link <args>
   else
     command -nargs=+ HiLink hi def link <args>