llvm-mc: add page

[P2Tree]

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page(s) have at most 8 examples.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known): LLVM 19

[spageektti]

Hi. Thank you so much for your contribution!

[P2Tree]

Hi. Thank you so much for your contribution!

This is my first PR for tldr, thanks for your review.
Should I need to update this issue after PR merged? #6367

[spageektti]

Hi. Thank you so much for your contribution!

This is my first PR for tldr, thanks for your review.
Should I need to update this issue after PR merged? #6367

I will update the list.