[clang] [llvm] [Clang][AIX] Add -mloadtime-comment-vars flag to preserve identifying variables (PR #187986)

[Hubert Tong via cfe-commits]

================
@@ -1,14 +1,17 @@
-// Test -mloadtime-comment-vars= across a C++20 named-module boundary. Five
+// Test -mloadtime-comment-vars= across a C++20 named-module boundary. Six
 // scenarios, each named by its FileCheck or -verify prefix:
 //
 //   MOD       — the module unit is built to a BMI with the option and then
 //               compiled to IR from the BMI (the two-phase flow build systems
-//               use). Exported, module-linkage, internal-linkage, and inline
+//               use). Exported, module-linkage, and internal-linkage
 //               variables are all preserved: the implicit attribute is
-//               serialized, and the internal and inline variables reach
-//               CodeGen via the module-initializer list. The same IR is
-//               produced whether or not the option is repeated on the
-//               codegen step: the BMI already records the result.
+//               serialized, and the internal variable reaches CodeGen via
+//               the module-initializer list. The same IR is produced whether
+//               or not the option is repeated on the codegen step: the BMI
+//               already records the result. The name-matched inline variable
+//               is not preserved and, being unreferenced, is not emitted.
+//   inline    — the name-matched inline variable is diagnosed when the
+//               module unit is compiled.
----------------
hubert-reinterpretcast wrote:

This seems to be covered in `Sema/loadtime-comment-vars.cpp`.

https://github.com/llvm/llvm-project/pull/187986