[PATCH][GAS][1/8] aarch64: [SME] Add +sme option to -march

[Przemyslaw Wirkus]

Hi,

This series of patches (tagged [SME]) add support for the Scalable
Matrix Extension.  You can find information about the extension at [0].

Patch introduces new command line options: +sme, +sme-f64 and +sme-i64
to -march command line options.

Patch is first in series of eight patches. Series add new instructions and system
registers with corresponding test cases.

  [0] https://community.arm.com/developer/ip-products/processors/b/processors-ip-blog/posts/scalable-matrix-extension-armv9-a-architecture

OK for master?

gas/ChangeLog:

	* NEWS: Updated docs.
	* config/tc-aarch64.c: New SME command line options.
	* doc/c-aarch64.texi: Update docs.

include/ChangeLog:

	* opcode/aarch64.h (AARCH64_FEATURE_SME): New flag.
	(AARCH64_FEATURE_SME_F64): New flag.
	(AARCH64_FEATURE_SME_I64): New flag.

opcodes/ChangeLog:

	* aarch64-tbl.h (SME): New feature object.
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