[llvm] [X86][DAGCombiner][SelectionDAG] - Fold Zext Build Vector to Bitcast of widen Build Vector (PR #135010)

[Simon Pilgrim via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
+; RUN: llc -mcpu=znver5 -mtriple=x86_64-unknown-unknown < %s | FileCheck %s
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RKSimon wrote:

You should be able to remove this WidenBuildVector.ll file now - I've pushed 8b2d269db22d253ef07a48ef433bc94dc70f2c75 which contains these (cleaned up) tests for a wider range of x86 targets - please can you merge with trunk to see the codegen diffs?

https://github.com/llvm/llvm-project/pull/135010