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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. llvm-svn: 348320
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