[PATCH, BINUTILS, ARM] Add SSBB and PSSBB

[Sudakshina Das]

Hi

This patch adds the following speculation barrier instructions
to the ARM assembler and disassembler according to
https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability/download-the-whitepaper

SSBB
PSSBB

These are added retrospectively to all older architectures,
and thus have been added to ARM_EXT_V3 for AArch32 and ARM_EXT_V6T2
for Thumb2.

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

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

Thanks
Sudi

*** opcodes/ChangeLog ***

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

	* arm-dis.c (arm_opcodes): Add ssbb and pssbb and move
	csdb together with them.
	(thumb32_opcodes): Likewise.

*** gas/ChangeLog ***

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

	* config/tc-arm.c (insns): Add new ssbb and pssbb instructions.
	* testsuite/gas/arm/csdb.s: Add new tests for ssbb and pssbb.
	* testsuite/gas/arm/csdb.d: Likewise
	* testsuite/gas/arm/thumb2_it_bad.s: Likewise.
	* testsuite/gas/arm/thumb2_it_bad.l: Likewise.
	* testsuite/gas/arm/barrier.d: Update with ssbb.
	* testsuite/gas/arm/barrier-thumb.d: Likewise.
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