[llvm-branch-commits] [llvm] [AArch64] Only create called thunks when hardening against SLS (PR #97472)

[Anatoly Trosinenko via llvm-branch-commits]

================
@@ -46,13 +40,5 @@ body:             |
 
 
 ...
----
-name:            __llvm_slsblr_thunk_x8
-tracksRegLiveness: true
-body:             |
-  bb.0.entry:
-    liveins: $x8
 
-    BR $x8
----------------
atrosinenko wrote:

The above lines are **input** to `llc`, so I removed them to not conflict with the thunks that are inserted by the pass. Unfortunately, MIR syntax is quite verbose, so I added a few basic CHECK lines testing MIR output and duplicated the RUN lines to generate and check assembly output as well.

Now there is no separation between function-rewriting and thunk-inserting passes, and I assumed it is safe to expect that initially there are no thunks in the module. I guess the original version of thunk insertion logic would assert on pre-existing thunks as well (due to unknown thunk names with `.1` suffix).

https://github.com/llvm/llvm-project/pull/97472