[committed] arm: Rename some tests to avoid duplicate tests names

[Hans-Peter Nilsson]

On Mon, 15 Sep 2025, Richard Earnshaw wrote:
> A number of arm-specific tests print the same name.  This can cause problems
> if one of those tests fails, since then comparing tests with GCC's
> compare_tests script can result in ambiguities in the changes summary.
> 
> Avoid this by giving tests unique names.

Another way to solve that, is to not use the "#name:" clause at 
all, so that the name defaults to the .d filename.  They're 
pretty unique, and as a bonus it's easier to find the test 
whenever it's failing.

I know, it's a matter of taste, so: "just saying". ;)

brgds, H-P