[llvm] SelectionDAG: Don't pad the source of ADDRSPACECAST if it's legal. (PR #225390)

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@llvm/pr-subscribers-llvm-selectiondag

Author: sujianIBM

<details>
<summary>Changes</summary>

With this use case `%out = addrspacecast <2 x ptr> %in to <2 x ptr addrspace(1)>` on z/OS, the res type is `v2i32` (illegal) and the source type is `v2i64` (legal).
Padding the source up to `v4i64` makes it illegal on z/OS and breaks the type legalization. 

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Full diff: https://github.com/llvm/llvm-project/pull/225390.diff


1 Files Affected:

- (modified) llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp (+3-2) 


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</details>


https://github.com/llvm/llvm-project/pull/225390