[Patch AArch64] Delete ASM_OUTPUT_DEF and fallback to default .set directive

[James Greenhalgh]

Hi,

As in the ARM port [1] , the AArch64 port wants to put out "b = a" to set
an alias. This doesn't cause us any trouble yet, as the AArch64 port doesn't
warn for this construct - but at the same time there is no reason for us
not to put out a .set directive - this seems to have been copied from the
ARM port when section anchor support was added in 2012. Looking through
the chain, we'll get a default definition for ASM_OUTPUT_DEF if SET_ASM_OP
is defined, and we get SET_ASM_OP defined through config/elfos.h for
all the AArch64 targets I can see in config.gcc. So we're safe to drop
this.

Bootstrapped on aarch64-none-linux-gnu.

OK?

Thanks,
James

[1]: https://gcc.gnu.org/ml/gcc-patches/2016-03/msg01691.html

---
2016-05-17  James Greenhalgh  <james.greenhalgh@arm.com>

	* config/aarch64/aarch64-elf.h (ASM_OUTPUT_DEF): Delete.

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