[PATCH v2] IBM Z: Use @PLT symbols for local functions in 64-bit mode

[Ilya Leoshkevich]

On Wed, 2021-07-07 at 21:03 +0200, Ilya Leoshkevich wrote:
> Bootstrapped and regtested on s390x-redhat-linux.  Ok for master?
> 
> v1: https://gcc.gnu.org/pipermail/gcc-patches/2021-June/573614.html
> v1 -> v2: Do not use UNSPEC_PLT in 64-bit code and rename it to
>           UNSPEC_PLT31 (Ulrich, Andreas).  Do not append @PLT only to
>           weak symbols in non-PIC code (Ulrich).  Add TLS tests.
> 
> 
> 
> This helps with generating code for kernel hotpatches, which contain
> individual functions and are loaded more than 2G away from vmlinux.
> This should not create performance regressions for the normal use
> cases, because for local functions ld replaces @PLT calls with direct
> calls.

Please disregard this patch, I just realized I missed two
output_asm_insn () calls in s390.c: one in function_profiler () and
one in s390_output_mi_thunk ().  I'll send a v3.