[PATCH][GOLD] Add -z nocopyreloc option.

[Ian Lance Taylor]

"Doug Kwan (關振德)" <dougkwan@google.com> writes:

>     This patch added a -z nocopyreloc option for compatiblity with ld.
>  Tested on x86_64 with no regression.

Please instead add an option -z copyreloc, with an appropriate
nohelpstring argument.  You will get the option -z nocopyreloc for
free.  That will make the option easier to understand in the code.

Also please take the opportunity to stamp out some duplication.  Move
may_need_copy_reloc to be a Symbol function.  Change everything except
ARM to just call that function.  Change ARM to use
arm_may_need_copy_reloc which can call that and also check for
STT_ARM_TFUNC.

Thanks.

Ian