Record minimal symbols directly in reader.

Record minimal symbols directly in reader.

This patch changes minimal symbol creation in two ways.  First, it
removes global variables in favor of members of minimal_symbol_reader.
Second, it changes functions like prim_record_minimal_symbol to be
member functions of minimal_symbol_reader.

2016-10-21  Tom Tromey  <tom@tromey.com>

	* xcoffread.c (record_minimal_symbol, scan_xcoff_symtab): Add
	"reader" argument.  Update.
	(xcoff_initial_scan): Update.
	* symfile.h (mdebug_build_psymtabs): Add "reader" argument.
	* mipsread.c (mipscoff_symfile_read): Update.
	(read_alphacoff_dynamic_symtab): Add "reader" argument.  Update.
	* minsyms.h (minimal_symbol_reader) <record, record_full>:
	Declare.
	<m_msym_bunch, m_msym_bunch_index, m_msym_count>: New members.
	<record_with_info>: New function, renamed from
	prim_record_minimal_symbol_and_info.
	* minsyms.c (msym_bunch, msym_bunch_index, msym_count): Remove
	globals.
	(minimal_symbol_reader): Initialize new members.
	(minimal_symbol_reader::record): Renamed from
	prim_record_minimal_symbol.
	(minimal_symbol_reader::record_full): Renamed from
	prim_record_minimal_symbol_full.
	(prim_record_minimal_symbol_and_info): Move to minsyms.h; rename.
	* mdebugread.c (mdebug_build_psymtabs, parse_partial_symbols)
	(record_minimal_symbol): Add "reader" argument.  Update.
	(elfmdebug_build_psymtabs): Update.
	* machoread.c (macho_symtab_add_minsym, macho_symtab_read): Add
	"reader" argument.  Update.
	(macho_symfile_read): Update.
	* elfread.c (record_minimal_symbol, elf_symtab_read)
	(elf_rel_plt_read): Add "reader" argument.  Update.
	(elf_read_minimal_symbols): Update.
	* dbxread.c (record_minimal_symbol, read_dbx_dynamic_symtab)
	(read_dbx_symtab): Add "reader" argument.  Update.
	(dbx_symfile_read): Update.
	* coffread.c (record_minimal_symbol, coff_symtab_read): Add
	"reader" argument.  Update.
	(coff_symfile_read): Update.
	* coff-pe-read.h (read_pe_exported_syms): Add "reader" argument.
	* coff-pe-read.c (add_pe_exported_sym, add_pe_forwarded_sym)
	(read_pe_exported_syms): Add "reader" argument.  Update.