[AARCH64] Fix vst1q_f32_x2 implementation

[malfet]

Add memory operands to inline asm, that informs the compiler that this instruction writes to memory.

Fixes #48901

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💊 CI failures summary and remediations

As of commit 48d6f98 (more details on the Dr. CI page):

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• 1/2 failures possibly* introduced in this PR
  • 1/1 non-CircleCI failure(s)
• 1/2 broken upstream at merge base 6b78644 from Dec 11 until Dec 12

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🚧 1 fixed upstream failure:

These were probably caused by upstream breakages that were already fixed.

Please rebase on the viable/strict branch (expand for instructions)

If your commit is older than viable/strict, run these commands:

git fetch https://github.com/pytorch/pytorch viable/strict
git rebase FETCH_HEAD

Check out the recency history of this "viable master" tracking branch.

• pytorch_linux_xenial_py3_6_gcc5_4_test from Dec 11 until Dec 12 (db5e5b4 - 8999915)
  • 🔁 rerun

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This comment has been revised 4 times.

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@malfet merged this pull request in a0432a7.