[llvm] [ConstantFolding] Fix bitcasting vectors with non-integer ratios (PR #179640)

[Nikita Popov via llvm-commits]

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nikic wrote:

```suggestion
; RUN: opt < %s -passes=instsimplify -S -data-layout="e-p:32:32:32-i1:8:8-i8:8:8-f64:32:64-v64:64:64-v128:128:128" | FileCheck %s --check-prefixes=CHECK,LE
```
and similar for the others. There should be a common check line for LE and BE for the cases where they are the same.

https://github.com/llvm/llvm-project/pull/179640