[commit] New method find_frame_sal()

[Andrew Cagney]

Hello,

While cleaning up accesses to the `struct frame_info', I kept coming 
across code snippits like:

  sal = find_pc_line (fi->pc,
                      (fi->next != (struct frame_info *) NULL
                       && !(get_frame_type (fi->next) == SIGTRAMP_FRAME)
                       && !(get_frame_type (fi->next) == DUMMY_FRAME)));

(Originally it was worse, as there was also fi->signal_handler_caller 
and PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame).)

The attached patch adds the function:

	find_frame_sal(fi, &sal);

that encapsulates all of the above.

The sole motivation for this being to eliminate all those frame pointer 
dereferences.

committed,
Andrew
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