[llvm] [SelectionDAG] Mark frame index as "aliased" at argument copy elison (PR #89712)

[Matt Arsenault via llvm-commits]

================
@@ -0,0 +1,39 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
+; RUN: llc -mtriple hexagon-- -O3 -o - %s | FileCheck %s
----------------
arsenm wrote:

Do you really need the -O3? It doesn't make a difference on most targets and -O2 is the default 

https://github.com/llvm/llvm-project/pull/89712