Add missing keywords to LLVM lexer

[pyrmont]

There are a number of keywords missing from the LLVM lexer. This PR adds them to the appropriate group.

It fixes #1502.

[pyrmont]

@guiferviz Thanks for the bug report. I had a look through the page you linked and I couldn't find the following keywords that you extracted from the Pygments lexer. Are these mistakes?

avr_intrcc
avr_signalcc
deplibs
function
ghccc
hhvm_ccc
hhvmcc
inline
intel_ocl_bicc
msp430_intrcc
none
spir_func
spir_kernel
unknown
variable
win64cc
x86_64_sysvcc
x86_intrcc
x86_regcallcc
x86_thiscallcc
x86_vectorcallcc

[guiferviz]

@pyrmont Thanks for your work.
You mean the link of the LLVM LangRef, right?

Unfortunately I'm not an LLVM expert and I can't tell you 100% sure what all those keywords are for.
I know some of them are calling conventions, very specific to the machine you're generating the code for. That's why I think they are not in the LLVM LangRef. LLVM's documentation is not particularly complete. It is a documentation that is made for people who already know how to use the tool 🤣

I've found this code that generates LLVM IR code (the code we are trying to highlight).

Also, if you search for those words in the LLVM repository maybe you get a *.ll file with those keywords. *.ll is the extension of LLVM IR code. For example, in this link you will see all the files with x86_vectorcallcc in the LLVM repository.
I didn't check all of them though.

We can:

• Rely on Pygments keywords.
• Check if all the keywords are in a *.ll file in the LLVM repository.
• Wait for someone to open a new bug :)

[guiferviz]

Maybe I write to you so fast... I've just found this lexer. It's the official LLVM lexer for reading *.ll files!
It contains all those keywords.

[pyrmont]

@guiferviz Thanks for finding that lexer file. I wrote a Rake task that will automatically generate the keywords and put them into a file that can then be loaded as needed. How does it look?

[guiferviz]

It looks terrific! Now we are sure that it contains all the keywords.
I can't do a technical review of the code because I just learned what Rack is, but I checked that the generated keywords are in the Pygements lexer. We now even have 21 more keywords than the Pygments lexer!
Thank you so much!

[pyrmont]

@guiferviz Thanks for your help on this! This will be part of the next version of Rouge: v3.19.0. That's scheduled for release on Tuesday 12 May. Thanks again!

[guiferviz]

@pyrmont Thanks for your time!