[Morello] Set LSB for c64 symbols in object code

[Morello] Set LSB for c64 symbols in object code

The Morello processor takes the LSB of the PCC (i.e. the capability
equivalent of PC) as a hint to set PE state to C64 when set and A64
otherwise.

bfd/ChangeLog:

2020-10-20  Siddhesh Poyarekar  <siddesh.poyarekar@arm.com>

	* elfnn-aarch64.c (elfNN_aarch64_final_link_relocate): Set LSB for C64 symbols.
	(elfNN_aarch64_output_map_sym, elfNN_aarch64_output_stub_sym):
	Initialise st_target_internal.
	(aarch64_elfNN_swap_symbol_in, aarch64_elfNN_swap_symbol_out):
	New functions.
	(elfNN_aarch64_size_info): Add them as callbacks.

gas/ChangeLog:

2020-10-20  Siddhesh Poyarekar  <siddesh.poyarekar@arm.com>

	* config/tc-aarch64.c: Include cpu-aarch64.h.
	(IS_C64): New macro.
	(make_mapping_symbol, aarch64_frob_label): Set LSB of C64
	symbol.
	(aarch64_adjust_symtab): Mark all C64 functions.
	(parse_operands): Set LSB when target of ADR is a function.
	(aarch64_fix_adjustable): New function.
	* config/tc-aarch64.h (AARCH64_SET_FLAG, AARCH64_RESET_FLAG,
	AARCH64_FLAG_C64, AARCH64_IS_C64, AARCH64_SET_C64): New
	macros.
	(aarch64_fix_adjustable): New function.
	(tc_fix_adjustable): Use it.

include/ChangeLog:

2020-10-20  Siddhesh Poyarekar  <siddesh.poyarekar@arm.com>

	* elf/aarch64.h (aarch64_st_branch_type): New enum.

opcodes/ChangeLog:

2020-10-20  Siddhesh Poyarekar  <siddesh.poyarekar@arm.com>

	* aarch64-dis.c: Include elf/aarch64.h.
	(get_sym_code_type): Identify C64 functions.