[PATCH] xtensa: fix PR target/90922

[augustine.sterling@gmail.com]

On Tue, Jun 18, 2019 at 2:27 PM Max Filippov <jcmvbkbc@gmail.com> wrote:
>
> Stack pointer adjustment code in prologue missed a case of no
> callee-saved registers and a stack frame size bigger than 128 bytes.
> Handle that case.
>
> This fixes the following gcc tests with call0 ABI:
>   gcc.c-torture/execute/stdarg-2.c
>   gcc.dg/torture/pr55882.c
>   gcc.dg/torture/pr57569.c

Approved, please apply.