[llvm] Move ExpandMemCmp and MergeIcmp to the middle end (PR #77370)

[Nikita Popov via llvm-commits]

================
@@ -0,0 +1,48 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
+; RUN: opt -S -passes=expand-memcmp -mcpu=pwr8 -mtriple=powerpc64le-unknown-gnu-linux < %s | FileCheck %s
+
+; This tests interaction between MergeICmp and expand-memcmp.
----------------
nikic wrote:

Does it? This test looks broken to me.

https://github.com/llvm/llvm-project/pull/77370