[AArch64][GlobalISel] Re-enable selection of volatile loads.
We previously disabled this in r323371 because of a bug where we selected an
extending load, but didn't delete the old G_LOAD, resulting in two loads being
generated for volatile loads.
Since we now have dedicated G_SEXTLOAD/G_ZEXTLOAD operations, and that the
tablegen patterns should no longer be able to select (ext(load x)) patterns, it
should be safe to re-enable it.
The old test case should still work as expected.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@348320
91177308-0d34-0410-b5e6-
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