[PATCH][AArch64] Add ARMv8.3 combined pointer authentication load instructions

[Szabolcs Nagy]

Add support for ARMv8.3 LDRAA and LDRAB combined pointer authentication and
load instructions.

These instructions authenticate the base register and load 8 byte from it plus
a scaled 10-bit offset with optional writeback to update the base register.

A new instruction class (ldst_imm10) and operand type (AARCH64_OPND_ADDR_SIMM10)
were introduced to handle the special addressing form.

include/
2016-11-08  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* opcode/aarch64.h (enum aarch64_opnd): Add AARCH64_OPND_ADDR_SIMM10.
	(enum aarch64_insn_class): Add ldst_imm10.

opcodes/
2016-11-08  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* aarch64-tbl.h (QL_X1NIL): New.
	(arch64_opcode_table): Add ldraa, ldrab.
	(AARCH64_OPERANDS): Add "ADDR_SIMM10".
	* aarch64-asm.h (aarch64_ins_addr_simm10): Declare.
	* aarch64-asm.c (aarch64_ins_addr_simm10): Define.
	* aarch64-dis.h (aarch64_ext_addr_simm10): Declare.
	* aarch64-dis.c (aarch64_ext_addr_simm10): Define.
	* aarch64-opc.h (enum aarch64_field_kind): Add FLD_S_simm10.
	* aarch64-opc.c (fields): Add data for FLD_S_simm10.
	(operand_general_constraint_met_p): Handle AARCH64_OPND_ADDR_SIMM10.
	(aarch64_print_operand): Likewise.
	* aarch64-asm-2.c: Regenerate.
	* aarch64-dis-2.c: Regenerate.
	* aarch64-opc-2.c: Regenerate.

gas/
2016-11-08  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* config/tc-aarch64.c (parse_operands): Handle AARCH64_OPND_ADDR_SIMM10.
	(fix_insn): Likewise.
	(warn_unpredictable_ldst): Handle ldst_imm10.

gas/testsuite/
2016-11-08  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* gas/aarch64/pac.s: Add ldraa and ldrab tests.
	* gas/aarch64/pac.d: Likewise.
	* gas/aarch64/illegal-ldraa.s: New.
	* gas/aarch64/illegal-ldraa.l: New.
	* gas/aarch64/illegal-ldraa.d: New.

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