Peter Rong 3b2476910b [WASM] Prevent casting undef to CosntantSDNode ...

WebAssembly tries to cast an `undef` to `CosntantSDNode` during `LowerAccessVectorElement`.
These operations will trigger an assertion error in cast.
To avoid this issue, we prevent casting, and abort the lowering operation.
A unit test is also included.

This patch fixes [pr61828](https://github.com/llvm/llvm-project/issues/61828)

Reviewed By: tlively

Differential Revision: https://reviews.llvm.org/D147198

2023-03-30 20:14:11 -07:00

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