gdb/

gdb/
	GDB internal type support for STT_GNU_IFUNC.
	* elfread.c (record_minimal_symbol): Support mst_text_gnu_ifunc.
	(elf_symtab_read): Set mst_text_gnu_ifunc for
	BSF_GNU_INDIRECT_FUNCTION.
	* eval.c (evaluate_subexp_standard): Support TYPE_GNU_IFUNC.
	* gdbtypes.c (init_type): Support TYPE_FLAG_GNU_IFUNC,
	builtin_func_func, nodebug_text_gnu_ifunc_symbol and
	nodebug_got_plt_symbol.
	* gdbtypes.h (enum type_flag_value): New entry TYPE_FLAG_GNU_IFUNC.
	(TYPE_GNU_IFUNC): New.
	(struct main_type): New field flag_gnu_ifunc.
	(struct builtin_type): New field builtin_func_func.
	(struct objfile_type): New fields nodebug_text_gnu_ifunc_symbol and
	nodebug_got_plt_symbol.
	* minsyms.c (lookup_minimal_symbol_text): Support mst_text_gnu_ifunc.
	(in_gnu_ifunc_stub): New.
	(prim_record_minimal_symbol, find_solib_trampoline_target): Support
	mst_text_gnu_ifunc.
	* parse.c (write_exp_msymbol): New variable ifunc_msym.  Detect and
	support mst_text_gnu_ifunc.  Support mst_slot_got_plt.
	* solib-svr4.c (svr4_in_dynsym_resolve_code): Return true also for
	in_gnu_ifunc_stub.
	* symmisc.c (dump_msymbols): Support mst_text_gnu_ifunc.
	* symtab.c (search_symbols): Likewise.
	* symtab.h (enum minimal_symbol_type): New fields mst_text_gnu_ifunc
	and mst_slot_got_plt.
	(in_gnu_ifunc_stub): New declaration.