8.0 debugging changes.

8.0 debugging changes.

Added a procedure COMPILED-CODE-BLOCK/NAME to guess the name of the
procedure in the compiled code block.  If the dbg info has only one
top-level procedure then use the name of that procedure, otherwise
return false.  Requires LOAD-DEBUGGING-INFO-ON-DEMAND? to be true to
load the dbg info.

Fixed HARDWARE-TRAP-FRAME/DESCRIBE to use the new 8.0 debugging
information - it was an oversight that it was still trying to use the
old debugging locator to identify the file name for the compiled code
block.  Also use COMPILED-CODE-BLOCK/NAME to identify the procedure.

Together, these changes mean that (with LOAD-DEBUGGING-INFO-ON-DEMAND?
true), SIGSEGVs and SIGFPEs can usually identify the offending
procedure by name.