* breakpoint.c (expand_line_sal_maybe): Always call skip_prologue_sal.

	* breakpoint.c (expand_line_sal_maybe): Always call skip_prologue_sal.
	(skip_prologue_sal): Remove local definition.
	(resolve_sal_pc): Remove now unnecessary code.
	* linespec.c (minsym_found): Call skip_prologue_sal.
	* symtab.c (find_function_start_pc): Remove.
	(find_function_start_sal): Extract prologue skipping into ...
	(skip_prologue_sal): ... this new function.  Handle code both
	with and without debug info.  Respect SAL's explicit_pc and
	explicit_line flags.  Inline old find_function_start_pc.
	* symtab.h (find_function_start_pc): Remove.
	(skip_prologue_sal): Add prototype.