[llvm] [SelectionDAG] Legalize vector types for atomic load (PR #111414)

[via llvm-commits]

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+; RUN: llc %s --print-after-isel --disable-verify 2>&1 | FileCheck %s
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jofrn wrote:

So should we do `-print-after=unpack-mi-bundles` (since unpack-mi-bundles is the last x86 pass)? We need the mir to check the acquire ordering, which is apparent in the mir yet not the isa. 

https://github.com/llvm/llvm-project/pull/111414