gdb/testsuite: remove actual addresses from some test names

gdb/testsuite: remove actual addresses from some test names

After commit:

  commit 10f92414d6d4a5f8eb8cbb2bf39ca86c1f9c1da5
  Date:   Fri Jan 15 12:14:45 2021 +0100

      [gdb/testsuite] Fix gdb.fortran/array-slices.exp with -m32

Some test names now contain the addresses of variables from the
inferior.  When running the test in different directories I'm seeing
slightly different values for the addresses.  This makes comparing
test results between directories harder than it needs to be.

This commit just gives the tests a descriptive name without including
the addresses.

gdb/testsuite/ChangeLog:

	* gdb.fortran/array-slices.exp (run_test): Avoid including
	addresses in test names.