[llvm] [MergeFunc] Fix crash caused by bitcasting ArrayType (PR #133259)

[Florian Hahn via llvm-commits]

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@@ -0,0 +1,38 @@
+; RUN: opt -S -passes=mergefunc < %s | FileCheck %s
+
+%A = type { double }
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fhahn wrote:

Could you also add a test that requires a bitcast e.g. where one leaf type is double and the other `i64`? Not sure if such types would get handled by mergefunc though. 

https://github.com/llvm/llvm-project/pull/133259