[llvm] [LangRef] Clarify definition of fragments and debug intrinsics (PR #82019)

[Adrian Prantl via llvm-commits]

================
@@ -130,6 +130,40 @@ debugging information influences optimization passes then it will be reported
 as a failure.  See :doc:`TestingGuide` for more information on LLVM test
 infrastructure and how to run various tests.
 
+.. _variables_and_variable_fragments:
+
+Variables and Variable Fragments
+================================
+
+Source language variables (or just "variables") are represented by `local
----------------
adrian-prantl wrote:

should we add "and constants"?

https://github.com/llvm/llvm-project/pull/82019