PowerPC disassembly of pcrel references

This adds some annotation to Power10 pcrel instructions, displaying
the target address (ie. pc + D34 field) plus a symbol if there is one
at exactly that target address.  pld from the .got or .plt will also
look up the entry and display it, symbolically if there is a dynamic
relocation on the entry.

include/
	* dis-asm.h (struct disassemble_info): Add dynrelbuf and dynrelcount.
binutils/
	* objdump.c (struct objdump_disasm_info): Delete dynrelbuf and
	dynrelcount.
	(find_symbol_for_address): Adjust for dynrelbuf and dynrelcount move.
	(disassemble_section, disassemble_data): Likewise.
opcodes/
	* ppc-dis.c (struct dis_private): Add "special".
	(POWERPC_DIALECT): Delete.  Replace uses with..
	(private_data): ..this.  New inline function.
	(disassemble_init_powerpc): Init "special" names.
	(skip_optional_operands): Add is_pcrel arg, set when detecting R
	field of prefix instructions.
	(bsearch_reloc, print_got_plt): New functions.
	(print_insn_powerpc): For pcrel instructions, print target address
	and symbol if known, and decode plt and got loads too.
gas/
	* testsuite/gas/ppc/prefix-pcrel.d: Update expected output.
	* testsuite/gas/ppc/prefix-reloc.d: Likewise.
	* gas/testsuite/gas/ppc/vsx_32byte.d: Likewise.
ld/
	* testsuite/ld-powerpc/inlinepcrel-1.d: Update expected output.
	* testsuite/ld-powerpc/inlinepcrel-2.d: Likewise.
	* testsuite/ld-powerpc/notoc2.d: Likewise.
	* testsuite/ld-powerpc/notoc3.d: Likewise.
	* testsuite/ld-powerpc/pcrelopt.d: Likewise.
	* testsuite/ld-powerpc/startstop.d: Likewise.
	* testsuite/ld-powerpc/tlsget.d: Likewise.
	* testsuite/ld-powerpc/tlsget2.d: Likewise.
	* testsuite/ld-powerpc/tlsld.d: Likewise.
	* testsuite/ld-powerpc/weak1.d: Likewise.
	* testsuite/ld-powerpc/weak1so.d: Likewise.

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