[PATCH, BINUTILS, AARCH64] Add SSBB and PSSBB

[Sudakshina Das]

Hi

This patch adds the following speculation barrier instructions
to the AArch64 assembler and disassembler as given in:
https://static.docs.arm.com/ddi0596/a/DDI_0596_ARM_a64_instruction_set_architecture.pdf
SSBB
PSSBB

These are added retrospectively to all older architectures,
and thus have been added as CORE_INSN.

Testing done: Builds and reg tests all pass on aarch64-none-linux-gnu.
Updated test to check.

Is this ok for trunk? I do not have commit rights. If this seems ok
can someone commit it on my behalf.

Thanks
Sudi

*** opcodes/ChangeLog ***

2018-xx-xx  Sudakshina Das  <sudi.das@arm.com>

	* aarch64-tbl.h (aarch64_opcode_table): Add entry for
	ssbb and pssbb and update dsb flags to F_HAS_ALIAS.
	* aarch64-asm-2.c: Regenerate.
	* aarch64-dis-2.c: Regenerate.
	* aarch64-opc-2.c: Regenerate.

*** gas/ChangeLog ***

2018-xx-xx  Sudakshina Das  <sudi.das@arm.com>

	* testsuite/gas/aarch64/system.s: Add test for ssbb
	and pssbb.
	* testsuite/gas/aarch64/system.d: Update accordingly
	and remove explicit addresses.
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