[AArch64] Fix PR58460

PR58460, the add and sub shifted register instruction forms in AArch64
do not permit the stack register.  This patch removes k constraint
from the relevant patterns and adds reduced form of the test case.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@203157 138bc75d-0d04-0410-961f-82ee72b054a4