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

[Nikita Popov via llvm-commits]

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@@ -0,0 +1,2 @@
+if not 'PowerPC' in config.root.targets:
+    config.unsupported = True
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nikic wrote:

Doesn't appear to be used?

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