[llvm] [GlobalISel] Make sure to check for load barriers when merging G_EXTRACT_VECTOR_ELT into G_LOAD. (PR #82306)

[Jessica Paquette via llvm-commits]

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@@ -0,0 +1,91 @@
+# RUN: llc -run-pass=aarch64-prelegalizer-combiner %s -o - | FileCheck %s
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ornata wrote:

might want -verify-machineinstrs or whatever

also a lot of people use the update_mir_test_checks script for GISel testcases

https://github.com/llvm/llvm-project/pull/82306