[PATCH, AArch64] Implement LSE feature

[Jiong Wang]

This patch implements support for AArch64 LSE.

OK?

include/opcode/
   * aarch64.h (AARCH64_FEATURE_LSE): New feature added.
   (aarch64_opnd): Add AARCH64_OPND_PAIRREG.
   (aarch64_insn_class): Add lse_atomic.
   (F_LSE_SZ): New field added.
   (opcode_has_special_coder): Recognize F_LSE_SZ.

opcode/
   * aarch64-tbl.h (QL_R4NIL): New qualifiers.
   (aarch64_feature_lse): New feature added.
   (LSE): New Added.
   (aarch64_opcode_table): New LSE instructions added.
   Improve descriptions for ldarb/ldarh/ldar.
   (aarch64_opcode_table): Describe PAIRREG.
   * aarch64-opc.h (aarch64_field_kind): Add FLD_lse_sz.
   * aarch64-opc.c (fields): Add entry for F_LSE_SZ.
   (aarch64_print_operand): Recognize PAIRREG.
   (operand_general_constraint_met_p): Check reg pair
   constraints for CASP instructions.
   * aarch64-dis.c (aarch64_ext_regno_pair): New extractor for
   paired reg.
   (do_special_decoding): Recognize F_LSE_SZ.
   * aarch64-asm.c (do_special_encoding): Recognize F_LSE_SZ.

gas/
   * config/tc-aarch64.c (parse_operands): Recognize PAIRREG.
   (aarch64_features): Add entry for lse extension.

gas/testsuite/
   * gas/aarch64/lse-atomic.d: New.
   * gas/aarch64/lse-atomic.s: Ditto.
   * gas/aarch64/illegal-lse.d: Ditto.
   * gas/aarch64/illegal-lse.l: Ditto.
   * gas/aarch64/illegal-lse.s: Ditto.
   * gas/aarch64/diagnostic.s: Check processor feature detect
   for lse instruction.
   * gas/aarch64/diagnostic.l: Ditto.
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