* c-typeprint.c (c_type_print_base): Use `show' of -1 to print

	* c-typeprint.c (c_type_print_base):  Use `show' of -1 to print
	the return type of methods to avoid infinite loops with anonymous
	types.
	* valops.c (search_struct_field):  Handle anonymous unions.

	* sparc-tdep.c (sunos4_skip_trampoline_code):  New function
	to correctly handle steps into -g compiled PIC objects in the
	main executable.
	* config/sparc/tm-sun4os4.h (SKIP_TRAMPOLINE_CODE):
	Redefine to use sunos4_skip_trampoline_code.

	* dwarfread.c (DWARF_REG_TO_REGNUM):  Provide a default mapping
	from DWARF to GDB register numbering.
	* dwarfread.c (locval):  Use DWARF_REG_TO_REGNUM to map the
	register value.
	* config/mips/tm-mipsv4.h (DWARF_REG_TO_REGNUM):  Define.