[SVE ACLE] Tidy up function names in testcases

[Richard Sandiford]

While looking through the SVE ACLE tests again, I realised the
naming of the test functions was a bit inconsistent.  The patch
below adopts the following scheme:

  test_[mxz]:
    a test that isn't focusing on the register allocation.  More
    specifically, this means that there are no other functions in
    the test file that differ from this one only in their register
    allocation.

  test_[mxz]_tied<N>:
    a test in which the output operand is tied to the <N>th input
    operand (counting from 1).

  test_[mxz]_untied:
    a test in which the output operand is not tied to any input operand.

The patch also adds some missing z_untied tests.

Tested on aarch64-linux-gnu and applied to aarch64/sve-acle-branch.

Richard


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