[llvm] [RemoveDIs] Add documentation for IR debug records (PR #81156)

[Felipe de Azevedo Piovezan via llvm-commits]

================
@@ -268,6 +279,60 @@ The formal LLVM-IR signature is:
 
 See :doc:`AssignmentTracking` for more info.
 
+.. _debug_records:
+
+Debug Records
+----------------------------
+
+LLVM also has an alternative to intrinsic functions, debug records, which
+function similarly but are not instructions. The basic syntax for debug records
+is:
+
+.. code-block:: llvm
+
+  call void llvm.dbg.<type>([metadata <arg>, ]*), !dbg <DILocation> ; Intrinsic model
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felipepiovezan wrote:

`type` is a very overloaded term, and it doesn't capture what we want here.
Maybe `kind` instead?

https://github.com/llvm/llvm-project/pull/81156