[ping] Change static chain to r11 on aarch64

[Olivier Hainque]

Hello,

Ping for part of the changes last proposed here:

 https://gcc.gnu.org/ml/gcc-patches/2018-11/msg00761.html

Submitted separately as an attempt to facilitate the review
process.

This piece is the change of static chain from r18 to r11.

Regression testing with languages=all on an aarch64-linux box
uncovered (various go related test failures) that libffi needs
a synchronized adjustment.

This is the updated version of the patch, so bootstrapped and
regression tested clean on aarch64-linux.

OK to commit ?

Thanks in advance!

With Kind Regards,

Olivier

2018-12-12  Olivier Hainque  <hain...@adacore.com>

        gcc/
        * config/aarch64/aarch64.h (STATIC_CHAIN_REGNUM): Use R11 instead
        of R18.

        gcc/testsuite/
        * gcc.dg/cwsc1.c: Expect r11 as the static chain on aarch64.

        libffi/
        * src/aarch64/sysv.S (ffi_call_SYSV): Expect r11 as the static chain.
        (ffi_go_closure_SYSV): Likewise.
        * testsuite/libffi.go/static-chain.h: Likewise.

0003-Change-static-chain-from-r18-to-r11-on-aarch64.patch
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