[Patch AArch64] Turn on -fasynchronous-unwind-tables and -funwind-tables by default.

[Ramana Radhakrishnan <ramana dot radhakrishnan at foss dot arm dot com>]

Jakub commented here that
https://gcc.gnu.org/ml/gcc-patches/2018-02/msg01325.html we don't turn
on fasynchronous-unwind-tables for AArch64. I note that x86_64 turns on
funwind-tables as well. Thus this patch turns on both.

Note that this doesn't increase code size but will likely increase
binary size because we now have a lot more eh_frame / debug_frame
information being spat out. We probably need to do get the clang /llvm
guys to do the same but I'll prod them separately.

Bootstrapped and regression tested on aarch64-none-linux-gnu.

Ok ?

regards
Ramana


config.gcc (aarch64*-*-linux*): New TARGET_DEFAULT_ASYNC_UNWIND_TABLES

common/config/aarch64/aarch64-common.c (aarch64_optimization_table[]):
Turn on fasynchronous-unwind-tables and funwind-tables.

Attachment: p1.txt
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