PATCH: revert find_pc_sect_line sanity check

[Jim Blandy <jimb@zwingli.cygnus.com>]

2001-11-26  Jim Blandy  <jimb@redhat.com>

	* symtab.c (find_pc_sect_line): Revert change of 2001-11-13; add
	comment explaining that hand-written assembly code can have line
	number info but no debug info for an enclosing function.

Index: symtab.c
===================================================================
RCS file: /cvs/src/src/gdb/symtab.c,v
retrieving revision 1.48
diff -c -c -b -F'^(' -r1.48 symtab.c
*** symtab.c	2001/11/13 16:42:50	1.48
--- symtab.c	2001/11/26 23:58:08
***************
*** 1570,1582 ****
  
    INIT_SAL (&val);		/* initialize to zeroes */
  
!   /* Don't even think about line numbers if we can't find a function
!      symbol for PC.  */
!   if (find_pc_function (pc) == NULL)
!     {
!       val.pc = pc;
!       return val;
!     }
  
    if (notcurrent)
      pc -= 1;
--- 1570,1581 ----
  
    INIT_SAL (&val);		/* initialize to zeroes */
  
!   /* It's tempting to assume that, if we can't find debugging info for
!      any function enclosing PC, that we shouldn't search for line
!      number info, either.  However, GAS can emit line number info for
!      assembly files --- very helpful when debugging hand-written
!      assembly code.  In such a case, we'd have no debug info for the
!      function, but we would have line info.  */
  
    if (notcurrent)
      pc -= 1;