[PATCH][GAS][AArch64] Define BRBE system registers

[Przemyslaw Wirkus]

This patch introduces BRBE (Branch Record Buffer Extension) system
registers.

Note: as this is register only extension, we do not want to hide these
registers behind -march flag going forward (they should be enabled by
default).

Regression tested against master branch and no issues.

OK for master branch?

Kind regards,
Przemyslaw Wirkus

gas/ChangeLog:

2020-10-08  Przemyslaw Wirkus  <mailto:przemyslaw.wirkus@arm.com>

	* NEWS: Docs update.
	* testsuite/gas/aarch64/brbe-invalid.d: New test.
	* testsuite/gas/aarch64/brbe-invalid.l: New test.
	* testsuite/gas/aarch64/brbe-invalid.s: New test.
	* testsuite/gas/aarch64/brbe.d: New test.
	* testsuite/gas/aarch64/brbe.s: New test.

opcodes/ChangeLog:

2020-10-08  Przemyslaw Wirkus  <mailto:przemyslaw.wirkus@arm.com>

	* aarch64-opc.c: Add BRBE system registers.
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